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S'(t) = 0
-t² + 6t - 5 = 0
t²-6t+5=0
(t-1)(t-5) = 0
t=1⇒S(1) = -1/3 + 3 - 5 = -7/3
t=5⇒S(5) = -125/3 + 225/3 - 45/3 = 55/3
saat bola mencapai tinggi maksimum adalah t = 5
f(x) = x - 3
x² - 7x + 12
f(3) = (3-3)/(3²-7(3) + 12) = 0