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f'(x) = 2x - 10
titik puncak trjadi jika f'(x) = 0
2x - 10 = 0
2x = 10
x = 5
f(5) = - 10(5) + 25 = 25 - 50 + 25 = 0
x = 5, y = 0
jadi, koordinat titik puncak dr fungsi kuadrat f(x) = - 10x + 25 adalah (5, 0)
puncak
x = -b/2a --> x = -(-10)/2.1 = 10/2 = 5
y = f(5) = 5² - 10.5 + 25
= 25 - 50 + 25
= 0
jadi puncaknya (5,0)
semoga membantu ya.. ^_^