Which represents a quadratic function? f(x) = −8x3 − 16x2 − 4x f (x) = x 2 + 2x − 5 f(x) = + 1 f(x) = 0x2 − 9x + 7

Please note:  the proper way to denote exponentiation is to use the symbol         " ^ "

So you'd have x^2 + 2x - 5, with "x^2" meaning "x squared."

This is the only function that has the 2nd power of x and is therefore a quadratic function.

60 ÷ -20 x makes x = -3