Tentukan sumbu simetri dan nilai optimum dari grafik fungsi f(x) = x² – 2 x -8

x² – 2x – 8

a = 1

b = – 2

c = – 8

D = 36

Sumbu simetri

= – b/2a

= – (-2)/2

= 1

Nilai Optimum

= – D/4a

= – 36/4

= – 9