Question

x^2+8x+9=0 mim ajude socorro

Answer 1

x^2+8x+9=0

∆ = 8^2 - 4.1.9
∆ = 64 - 36
∆ = 28

x = (-8 +/- √28)/2.1
x = (-8 +/- 2√7)/2

x' = (-8+2√7)/2
x' = -8/2 + (2√7)/2
x' = -4 + √7

x" = (-8-2√7)/2
x" = -8/2 - (2√7)/2
x" = -4 - √7