f(-4)=(-4)2+21

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Solution for f(-4)=(-4)2+21 equation: 



f(-4)=(-4)2+21

We move all terms to the left:

f(-4)-((-4)2+21)=0

We add all the numbers together, and all the variables

f(-4)-13=0

We multiply parentheses

-4f-13=0

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

-4f=13

f=13/-4

f=-3+1/4

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