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(gof)(x) = 4x²-4x+6
g(2x-1) = 4x²-4x+6
misalkan a = 2x-1 maka x = (a+1)/2, jadi :
g(a) = 4(a+1 / 2)² - 4 (a+1)/2 + 6
= 4. a²+2a+1 / 4 - 2(a+1)6
= a²+2a+1-2a-2+6
= a²+5
jadi g(x) = x²+5