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Verified answer
Turunan f'(x)f'(x) = {5(x+4) - 1(5x-4)} / (x+4)²
f(0) = {5(0+4) - (5(0)-4)} / (0+4)²
= {5(4) - (-4)} / 4²
= {20+4} / 16
= 24/16
= 3/2