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(f(g))(x)= 2x²-4x+3
f(x-1) = 2(x-1)²+1 karena 2(x²-2x+1)+1
f(x) = 2x²+1
maka f(x+1)=2(x+1)²+1
=2(x²+2x+1)+1
= 2x²+4x+3
29.