Tentukan sumbu simetri dan nilai optimum dari grafik fungsi f(x) = -8x² – 16x – 1​

Jawab:

f(x) = -8x² – 16x – 1​

a = -8, b = -16, c = -1

Sumbu simetri:

x = -b/2a

x = -(-16)/2(-8)

x = 16/-16

x = -1

Nilai optimum:

y = -(b^2 – 4ac)/4a

y = -((-16)^2 – 4(-8)(-1))/4(-1)

y = -(256 – 32)/-4

y = -(224)/-4

y = -224/-4

y = 56

Semoga membantu