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x2-1=4x2+4x
(f(x))2 -1=4x2+4x
(f(x))2=4x2+4x+1
f(x)=√4x2+4x+1
f(x)=√(2x+1)2
f(x)=2x+1
f(x+1)=2(x+1) +1
=2x+3