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In the polynomial (p(x)=ax^3+bx^2+cx+d), (a\ne0). Why is it wrong to call (p(x)) a linear polynomial?

Answer and explanation

Correct answer: Because degree is (3)

The direct answer is C: the polynomial is cubic, not linear. The degree of a polynomial is the greatest exponent of the variable whose coefficient is not zero. In \(p(x)=ax^3+bx^2+cx+d\), the condition \(a\ne0\) guarantees that the term \(ax^3\) is present, so the highest power is exactly 3. Therefore the polynomial has degree 3 and is called a cubic polynomial. Option A is wrong because degree 1 describes a linear polynomial, such as \(mx+n\). Option B is wrong because degree 2 describes a quadratic polynomial; the \(x^2\) term is not the highest term here. Option C is correct because the non-zero leading term has power 3. Option D is irrelevant: \(d\) is only the constant term and does not decide the degree. Always inspect the largest non-zero exponent.

Related tags

PolynomialsDegreeCubicHard

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