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f(x) = -x² + 2x + 15 = -(x² - 2x - 1) + 14 = - (x - 1)² + 14
jadi nilai maksimumya adalah 14
x = -b/2a
x = -2/2.(-1)
x = -2/-2
x = 1
sustitusi
f(1) = -1²+2.1+15
= -1+2+15
= 16
jadi nilai maksimumnya 16
semoga membantu :)