Question

quais são as raizes da função f (x)= x elevado a 2 +2x-8=0.

Answer 1

x² + 2x - 8 = 0

Δ= 2² - 4 . 1 . ( - 8 )
Δ= 4 + 32
Δ= 36

x= -2 ± 6 / 2
x'= 4 / 2 = 2
x"= -8 / 2 = -4