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g(x+1) = 2x-3
g(x) = 2(x-1) - 3 = 2x -5
f o g (x) = - 2(2x-5) + 4
= - 24x = 39
maaf kalo salah
g(x) = 2x - 5
f(2x - 5) = (2x - 5)² - 2(2x - 5) + 4
= 4x² - 20x + 25 - 4x + 10 + 4
= 4x² - 24x + 39