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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

f(-5)-91=0

We multiply parentheses

-5f-91=0

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

-5f=91

f=91/-5

f=-18+1/5

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