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f(-2)=1/2(-2)^2
We move all terms to the left:
f(-2)-(1/2(-2)^2)=0
We multiply parentheses
-2f-(1/2(-2)^2)=0
We multiply all the terms by the denominator
-2f*2(-2)^2)-(1=0
Wy multiply elements
-4f^2(-=0
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