Question

Find f(−2) given that f(x)=2x2−3x+7.

Answer 1

21.

Explanation:

f(x) = 2x^2 - 3x + 7.

When x = -2,

f(-2) = 2(-2)^2 - 3(-2) + 7

= 2(4) - (-6) + 7

= 8 + 6 + 7

= 21.

Answer 2

21

Explanation:

So we have the function:

`f(x)=2x^2-3x+7`

And we want to find f(-2).

To do so, substitute -2 for x. Thus:

`f(-2)=2(-2)^2-3(-2)+7`

Square:

`f(-2)=2(4)-3(-2)+7`

Multiply:

`f(-2)=8+6+7`

Add:

`f(-2)=21`

And we're done!