Find f(-2) for the function f(x) = 3x2 - 2x + 7.

Solution:

Given, f(x) = 3x2 - 2x + 7

We have to find f(-2).

Put x= -2 in f(x)

f(-2) = 3(-2)2 - 2(-2) + 7

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

f(-2) = 12 + 11

f(-2) = 23

Therefore, f(-2) is 23.

Example: Find f(-4) for the function f(x) = 3x2 - 2x + 7.

Solution:

Given, f(x) = 3x2 - 2x + 7

We have to find f(-4).

Put x= -4 in f(x)

f(-4) = 3(-4)2 - 2(-4) + 7

f(-4) = 3(16) + 8 + 7

f(-4) = 48 + 15

f(-4) = 63

Therefore, f(-4) is 63.

Find f(-2) for the function f(x) = 3x2 - 2x + 7.

Summary:

f(-2) for the function f(x) = 3x2 - 2x + 7 is 23.

Math worksheets and
visual curriculum