Question

Nilai maksimum dari F(x) = -8x²+4x-5 adalah

Answer 1

F(x) = -8x² + 4x - 5
a = -8
b = 4
c = -5

y =
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Answer 2

F(x) = -8x² + 4x - 5

Dengan cara kalkulus:
Turunan Pertama;

f(x) = -8x² + 4x - 5
0 = -16x + 4
16x = 4
x = 4/16
x = 1/4

Subtitusi ke persamaan kuadrat
f(x) = -8x² + 4x - 5
f(1/4) = -8(1/4)² + 4(1/4) - 5
f(1/4) = -8(1/16) + 1 - 5
f(1/4) = -1/2 - 4
f(1/4) = -9/2

atau

f(1/4) = -4 1/2