Question

Alguem me ajuda X+10 = -9/x

Answer 1

X+10 = -9/x
X.(x +10) = - 9
x^2 + 10x = - 9
x^2 + 10x + 9 = 0
a=1; b = 10; x = 9
∆= b^2-4ac
∆ = 10^2-4.1.9
∆ = 100-36
∆ = 64

x = [- b +/- √∆] 2a
x = [ - 10+/- √64]/2.1
x = [- 10 +/- 8]/2
x ' = [-10-8]/2 = -18/2 = - 9
x " = [-10+8]/2 = -2/2 = - 1

R.: (- 9; - 1)