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x = -b/2a
= -(-8)/(2*1)
= 8/2
= 4
Nilai minimum f(x) dapat dihitung dengan menggunakan nilai x sbb:
f(x) = x² - 8x + 7
f(4) = 4² - 8(4) + 7
= 16 - 32 + 7
= -9
Nilai minimum = -9