Question

Which of the following are not quadratic polynomials?
(i) $3+4x–7x^2$

(ii) $8x^2–15$

(iii) 6x – 15

(iv) $4x^3–3x$

(v) $x^2–x+1$

Answer 1

i) $3+4x–7x^2$ is a polynomial of degree 2, so it is a quadratic polynomial.

ii) $8x^2–15$ is a polynomial of degree 2, so it is a quadratic polynomial.

iii) 6x – 15 is not a polynomial of degree 2, so it is not a quadratic polynomial.

iv) $4x^3–3x$ is a polynomial of degree 3, so it is not a quadratic polynomial.

v) $x^2–x+1$ is a polynomial of degree 2, so it is a quadratic polynomial.