If f(x)=3x^2 then f(-2)=?

2 Answers
Apr 30, 2018

f(-2)=12

Explanation:

f(x)=3x^2

To find f(-2) you just need to put -2 instead of x:

f(-2)=3(-2)^2=3*4=12

Apr 30, 2018

f(-2) = 12

Explanation:

All we need to do here is substitute the number in parentheses (-2) for x in the function:

f(-2) = 3(-2)^2 = 3(4) = 12

Note that the negative symbol from the -2 is included in the parentheses for the exponent.