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= 8x^2 - 8x +1
f(x) = x+2
f invers (x) = x-2
substitusi (x-2) ke pers:
2(x-2)^2 + 4 (x-2) + 1
= 2 (x^2 - 4x + 4) + 4x-8+1
= 2x^2-8x+8+4x-8+1
=2x^2-4x+1
g(2x) = 2(2x)^2 - 4(2x) + 1= 8x^2-8x+1