Question

Which is a quadratic function?

f(x) = 2x + x + 3
f(x) = 0x² - 4x + 7
f(x) = 5x² - 4x + 5
f(x) = 3x3 + 2x + 2

Answer 1

Answer:
`f(x)=5x^2-4x+5`

Explanation:

A quadratic function is as following;
`ax^2+bx+c`

Notice that it cannot be
`f(x)=0x^2-4x+7` because if you solve;
`0x^2=0` which eliminates the
`x^2`.