f(-1)=5(-1)^2+4(-1)

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Solution for f(-1)=5(-1)^2+4(-1) equation: 



f(-1)=5(-1)^2+4(-1)

We move all terms to the left:

f(-1)-(5(-1)^2+4(-1))=0

We add all the numbers together, and all the variables

f(-1)-1=0

We multiply parentheses

-1f-1=0

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

-f=1

f=1/-1

f=-1

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