please tolong saya jawab pertanyaan ini ya....

f(x) = 8x - 2x²
f(x) = ax² + bx + c
a = - 2
b = 8
c = 0

[tex]x = - \frac{b}{2a} \\ \\ x=- \frac{8}{2(-2)} \\ \\ x= -\frac{8}{-4} \\ \\ x=-(-2) \\ x=2 \\ \\ D=b^{2}-4ac \\ D=8^{2}-(4.(-2).(0)) \\ D=64-0 \\ D=64 \\ \\ y=- \frac{D}{4a} \\ \\ y= - \frac{64}{4(-2)} \\ \\ y=- \frac{64}{-8} \\ \\ y=-(-8) \\ y=8[/tex]

Titik Balik Maksimum = (2,8)