Question

Which function is a quadratic function?
a. u(x)= -x+3x^2 - 8
b. v(x) = 2x^2 + 8x^3 + 9x
c. y(x) = x^2 +3x^5 +4
d. z(x) = 7x^2+2x^3-3

Answer 1

a because in a quadratic the degree of the polynomial cant be greater than 2

Answer 2

it must be

\[ax^2+bx+c\]