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Geometrical meaning of the zeroes of a polynomial.
बहुपद के शून्यकों का ज्यामितीय अर्थ
In this Class 10 Mathematics topic from Polynomials, students understand the geometrical meaning of a polynomial’s zeroes by connecting algebraic expressions with their graphs. A zero is represented by the x-coordinate where the graph meets or touches the x-axis. Students learn how the number of points of intersection indicates the number of real zeroes, and interpret graphs of linear, quadratic, and other polynomial functions to relate their shapes and x-intercepts to solutions of p(x) = 0.
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Easy · Level 24 · product-of-zeroes,x-intercepts,polynomial-graph,polynomials,Geometrical meaning of the zeroes of a polynomial.,geometrical meaning of the zeroes of a polynomial,Mathematics,Class 10 MCQView options
Easy · Level 24 · polynomials,geometrical meaning of zeroes,graph intersections,Geometrical meaning of the zeroes of a polynomial.,geometrical meaning of the zeroes of a polynomial,Mathematics,Class 10 MCQView options
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Easy · Level 24 · polynomial zeros, zero polynomial, roots, algebra, class 10View options
Easy · Level 24 · polynomials,x-axis intercept,zero of polynomial,graphical meaning,Geometrical meaning of the zeroes of a polynomial.,geometrical meaning of the zeroes of a polynomial,Mathematics,Class 10 MCQView options
Easy · Level 24 · polynomials,real zeroes,x-axis intersections,Geometrical meaning of the zeroes of a polynomial.,geometrical meaning of the zeroes of a polynomial,Mathematics,Class 10 MCQView options
If the graph cuts the x-axis at (−2, 0) and (3, 0), then what is the product of the zeroes?
Correct answer: A
The x-intercepts of a polynomial graph give its zeroes. From the points (−2, 0) and (3, 0), the zeroes are −2 and 3. Their product is calculated directly: (−2) × 3 = −6. Therefore option A is correct. The y-coordinate is zero for both points because they lie on the x-axis, but it is not used when multiplying the zeroes; the zeroes are the x-coordinates. Option B loses the negative sign, option C could arise from adding the zeroes instead of multiplying them because −2 + 3 = 1, and option D is not the product or sum of the given values. The graph information is sufficient without knowing the polynomial’s leading coefficient.
In the graph, the points (0,0) and (3,0) lie on the x-axis. What are the possible zeroes of the corresponding polynomial?
Correct answer: A
Zeros of a polynomial are the x-values where its graph meets the x-axis (y = 0). The given points (0,0) and (3,0) have x-coordinates 0 and 3, so the zeros are 0 and 3. Distractor C wrongly uses -3 instead of 3 (wrong sign). Options B and D fail to include both intercepts. Exam tip: read the x-coordinate of each x-intercept — its y-value must be zero.
The graph of a cubic polynomial cuts the x-axis at three distinct points. What is the number of real zeroes?
Correct answer: A
The geometrical meaning of a zero is the x-coordinate of a point where the graph of p(x) meets or crosses the x-axis. On the x-axis, y = 0, so every distinct intersection represents a distinct real solution of p(x) = 0. The graph in the question has three different intersection points; therefore it has three different real zeroes. The fact that the polynomial is cubic is consistent with this result, since a cubic can have at most three real zeroes. Option B and Option C undercount the visible intersections, while Option D would mean that the graph never met the x-axis. Hence Option A is correct.
For the zero polynomial \(p(x)=0\), what is every \(x\)-value called?
Correct answer: A
A root (zero) of a polynomial is an x-value where the polynomial evaluates to 0. For the zero polynomial \(p(x)=0\), the polynomial equals 0 for every real x, so every x is a root. The distractors B and C are incorrect because they restrict roots to only positive or only negative numbers, whereas the zero polynomial has every real number as a root. Exam tip: treat the zero polynomial as a special case — its set of roots is the entire domain (all real numbers).
What is the x-axis intersection point of the graph of p(x)=3x?
Correct answer: A
Set p(x)=0 to find the root: \(3x=0\) gives \(x=0\). The x-axis intersection is the root written as a point \((x,0)\), so the intersection is \((0,0)\). The nearby distractor \((3,0)\) is incorrect because it corresponds to x=3, whereas \(3x\) vanishes only at x=0. Exam tip: always solve p(x)=0 and express the answer as \((root,0)\).
If the line \(y = x + 2\) cuts the x-axis, what is the x-coordinate of the point of intersection?
Correct answer: A
On the x-axis, \(y=0\). Substituting gives \(0 = x + 2\), so \(x = -2\). Interpretation: the x‑intercept is the value of x that makes the expression equal to zero. The nearest distractor 2 is wrong due to the sign; 0 and 1 do not satisfy the equation. Exam tip: to find an x‑intercept always set \(y=0\) and solve for x.
If the graph of the line \(y=5-x\) is given, what is its zero (the x-value where y = 0)?
Correct answer: A
The zero is the x-value for which y = 0. For the line \(y=5-x\), set \(0=5-x\) which gives \(x=5\). Hence the zero is 5. The closest distractor 0 is wrong because at \(x=0\) the value is \(y=5\), not 0. Exam tip: to find the x-intercept of a line, set \(y=0\) and solve for \(x\).
If the x-axis intersection of a polynomial graph is (a, 0), what is the zero?
Correct answer: A
The governing concept is the geometrical meaning of a zero of a polynomial. A number r is a zero of p(x) when p(r) = 0. On a graph, this means that the point (r, 0) lies on the x-axis. Since the stated intersection is (a, 0), substituting its x-coordinate gives p(a) = 0; hence the zero is a. Therefore, option A is the precise answer. The second coordinate, 0, describes the y-coordinate and only confirms that the point lies on the x-axis; it is not the requested zero. Option C simplifies algebraically to a, but option A gives the standard and direct value. Option D changes the sign without any basis.
If \(p(2)=3\) then the point \((2,3)\) lies on the graph. Is 2 a zero (root) of \(p(x)\)?
Correct answer: A
By definition a number a is a zero (root) of a polynomial iff \(p(a)=0\). Here \(p(2)=3\), which is not zero, so 2 is not a zero. Option C is incorrect because the degree (quadratic or otherwise) does not change the criterion; any degree requires \(p(a)=0\) to be a root. Exam tip: evaluate the polynomial at the given value—if the result is 0, it is a root.
If \(p(-4)=0\), through which point must the graph of \(y=p(x)\) pass?
Correct answer: A
Reason: Interpret the polynomial as the function \(y=p(x)\). \(p(-4)=0\) means at \(x=-4\) the value \(y=0\), so the graph passes through the point \((-4,0)\). The closest distractor (0, −4) comes from swapping coordinates; it would be correct only if \(p(0)=-4\), which is not given. Exam tip: treat \(p(x)\) as the y-coordinate and plot the point \((x,p(x))\).
Which of the following points geometrically represents a zero of a polynomial directly?
Correct answer: A
A zero of a polynomial corresponds to an x‑intercept of its graph, i.e. a point whose y‑coordinate is zero. Thus the representing point must satisfy \(y=0\). The point (9,0) has y = 0, so x = 9 is a zero. The closest distractor (0,9) is incorrect because its y ≠ 0 (it lies on the y‑axis); similarly (9,9) and (0,-9) do not lie on the x‑axis. Exam tip: quickly check the y‑coordinate — zeros appear where y = 0.
The graph intersects the x-axis at (-1, 0) and (1, 0). What is the sum of the zeros?
Correct answer: A
The x-intercepts are the zeros of the polynomial; here the zeros are -1 and 1. Their sum is -1 + 1 = 0, so the correct answer is 0. Option D (1) is incorrect because it gives only one zero rather than the sum of both. Tip: symmetric zeros of the form ±a always sum to 0; more generally the sum of zeros relates to the coefficients (negative of the coefficient of x^{n-1} divided by leading coefficient).
In which situation will x = 3 be a zero of the polynomial?
Correct answer: A
If x = 3 is a zero then p(3) = 0. On the graph this means the point with x‑coordinate 3 lies on the x‑axis, i.e. (3, 0). Options B and C have y ≠ 0 so they cannot be zeros; option D has x = -3, not 3. Exam tip: substitute the given x into p(x) to check if it equals zero, or look for the point (x, 0) on the graph.
In which situation will (-6) be a zero of the polynomial?
Correct answer: A
A number a is a zero (root) of a polynomial if p(a)=0. If the graph meets the x-axis at (-6,0) then the function value at x=-6 is 0, so p(-6)=0 and -6 is a zero. Option B is wrong because (0,-6) is a y-axis intercept (x=0), not x=-6. Option C gives x=6, the wrong sign. Option D has y=6, so p(-6)=6≠0. Exam tip: a root corresponds to an x-intercept, so check the coordinate is (-6,0) with y=0 and the correct sign for x.
If no point of a polynomial graph lies on the x-axis, which statement is correct?
Correct answer: A
For a polynomial p(x), a real zero is a real number r satisfying p(r) = 0. On the coordinate graph y = p(x), this condition produces the point (r, 0), which lies on the x-axis. Thus real zeroes are represented exactly by x-axis intersections. If no point of the graph lies on that axis, there is no real value of x for which p(x) = 0. Therefore the polynomial has no real zero, as stated in Option A. Options B and C claim intersections that the question explicitly rules out. Option D is also false because a polynomial cannot have every number as a zero unless it is the zero polynomial, whose graph is the x-axis itself.
If the graph of a polynomial cuts the \\(x\\)-axis at \\(x=10\\), which of the following statements is true?
Correct answer: A
If the graph crosses the \\(x\\)-axis at \\(x=10\\), the point on the curve is \\( (10,0)\\). The polynomial's value at x equals the y-coordinate, so \\(p(10)=0\\). The closest distractor \\(p(-10)=0\\) is wrong because it refers to x = -10, not x = 10. The options \\(p(0)=10\\) and \\(p(10)=10\\) are inconsistent with crossing the x-axis because y must be 0 there. Exam tip: when told the graph crosses at \\(x=a\\), substitute x = a; a crossing on the x-axis means \\(p(a)=0\\).
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