Nilai maksimum fungsi y = -2x kuadrat + 8x - 9 adalah

Kelas 10 Matematika
Bab Fungsi Kuadrat

y = -2x² + 8x - 9
a = -2; b = 8; c = -9

sumbu simetri
= -b/2a
= -8/(2 . -2)
= 2

y = -2 (2)² + 8 . (2) - 9
y = -2 . 4 + 16 - 9
y = -8 + 16 - 9
y = -1

Nilai maksimum = -1

y= -2x² + 8x -9
a:-2 b: 8 c= 9

sumbu simetris
-b/2a
-8/2.(-2)
= 2

Nilai maksimum
y= -2x²+8x-9
y= -2(2)²+8(2)-9
y= -2×4 +8×2-9
y= -8 + 16-9
y= -1

jadi nilai maksimumnya= -1