Question

Which represents a quadratic function? f(x) = 2x3 + 2x2 – 4 f(x) = –7x2 – x + 2 f(x) = –3x + 2 f(x) = 0x2 + 3x – 3

Answer 1

B. f(x) = –7x2 – x + 2

Explanation:

the answer above me is right so I'm just shortening it so the answer is easy to find, have a great day !

Answer 2

Second option:
`f(x) =-7x^2 -x + 2`

Explanation:

A quadratic function has the form:

`f(x)=ax^2+bx+c`

(Where
`a\\eq0`)

You can observe that the highest exponent of a quadratic function is 2.

Then, let's check which of the options shows a quadratic function:

1)
`f(x) = 2x^3 + 2x^2 - 4`

Its highest exponent is 3, then this is not a quadratic function.

2)
`f(x) =-7x^2 -x + 2`

Its highest exponent is 2 and
`a\\eq0`, then this is a quadratic function.

3)
`f(x) = -3x + 2`

Its highest exponent is 1, then this is not a quadratic function.

4)
`f(x) =0x^2+3x-3`

You can observe that
`a=0`, then this is not a quadratic function.