Question

Find f(−2) given that f(x)=2x2−3x+7.

Answer 1

Answer:

21

Step-by-step 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!

Answer 2

Answer:

21.

Step-by-step 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.