Question

         2
f(x)=x +8x
me ajudemmmmmmmmmmmmmmmmmmmmmmmmmmmmm

Answer 1

x²+ 8x   a- 1 b - 8
▲ = b² - 4 . a . c 
▲ = (8)² - 4 . 1
▲ = 64 - 4
▲ = 60