f(-8)=-8^2+3(-8)+7

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Solution for f(-8)=-8^2+3(-8)+7 equation: 



f(-8)=-8^2+3(-8)+7

We move all terms to the left:

f(-8)-(-8^2+3(-8)+7)=0

We add all the numbers together, and all the variables

f(-8)+81=0

We multiply parentheses

-8f+81=0

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

-8f=-81

f=-81/-8

f=10+1/8

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