how to simplify f(-8) = x2 +6x -2

Question

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Answer 1

Normally an equation is written as f(x)=.......In this case, x=-8, so in the equation where ever there is an x you would put in the -8 and solve it: f(x)=x²+6x-2

f(-8)=(-8)²+6(-8)-2

f(-8)=64-48-2

f(-8)=14