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Verified answer
F(x)=x2-4xf(a)=a2-4a
f (a+3) = (a+3)2 - 4(a+3)
= a2+6a+9-4a-12
f(a+3) =a2+2a-3
a2+2a-3=0 => (a+3)(a-1)=0
a+3=0 => a=-3
a-1=0 => a=1
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