f(-2)=6^2-4

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Solution for f(-2)=6^2-4 equation: 



f(-2)=6^2-4

We move all terms to the left:

f(-2)-(6^2-4)=0

We add all the numbers together, and all the variables

f(-2)-32=0

We multiply parentheses

-2f-32=0

We move all terms containing f to the left, all other terms to the right

-2f=32

f=32/-2

f=-16

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