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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

f(-4)+20=0

We multiply parentheses

-4f+20=0

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

-4f=-20

f=-20/-4

f=+5

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