Evaluate the following function at the values 3, -4 and x-2.
f(x)=x^2 - 1
f(3) =
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f(3)=3^2. -1=9-1=8
f(-4)=-4^2. -1=16-1=15
f(x-2)=(x-2)^2-1=x^2-2x+1-1=x^2-2x
f(-4)=-4^2. -1=16-1=15
f(x-2)=(x-2)^2-1=x^2-2x+1-1=x^2-2x
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