Question

equação x² + 2x - 3 = 0

Answer 1

x² + 2x - 3 = 0
a= 1; b = 2, c = - 3
∆= b^2-4ac
∆ = 2^2 - 4.1.(-3)
∆ = 4+12
∆ = 16

x = [- b +/- √∆] /2a
x= [ - 2 +/- √16]/2.1
x = [ - 2 + 4]/2 = 4/2 = 2
x = [- 2 - 4]/2 = -6/2 = - 3

R.: (2; - 3)