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Subjects
Class 9MathematicsIntroduction to PolynomialsLinear polynomialsMediumLevel 33
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If the zero of (p(x)=ax+12) is (3), what is the value of (a)?

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Answer and explanation

Correct answer: -4

A zero of 3 means that the polynomial becomes 0 when x=3. Thus, p(3)=3a+12=0. Hence, 3a=-12 and a=-4. If a=4, then 3(4)+12=24, not 0. Exam tip: When a zero is given, substitute that value for x and set p(x)=0.

Related tags

PolynomialsLinear PolynomialsZeros Of PolynomialSubstitutionGrade 9 Mathematics

Frequently asked questions

What is the correct answer to this question?

-4

Why is this the correct answer?

A zero of 3 means that the polynomial becomes 0 when x=3. Thus, p(3)=3a+12=0. Hence, 3a=-12 and a=-4. If a=4, then 3(4)+12=24, not 0. Exam tip: When a zero is given, substitute that value for x and set p(x)=0.

Which subject and chapter does this question cover?

This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear polynomials.

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  1. 1If the highest power in a polynomial is 1, what is it called?
  2. 2Which expression is not a linear polynomial?
  3. 3Which expression is a polynomial but not a linear polynomial?
  4. 4Which statement is correct about the zeroes of a non-zero linear polynomial?
  5. 5Which expression is a polynomial in (s) and has degree (1)?
  6. 6If \(p(x)=ax+b\), where \(a\ne0\), is a linear polynomial, which property of its graph is always true?
  7. 7Which of the following expressions is a linear polynomial in \(x\)?
  8. 8A taxi charges a fixed fee of ₹50 and ₹12 per kilometre. If the distance travelled is represented by \(x\), which statement about \(C(x)=12x+50\) is correct?
  9. 9What type of polynomial is (4x-9)?
  10. 10What is the degree of a linear polynomial?
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