Question

Calcule com Δ = b²-4ac e x = – b ± √Δ

2.a .

x² +x-6=0

Answer 1

x² +x-6=0
a= 1; b = 1; c = - 6
∆= b^2-4ac
∆ = 1^2 - 4.1.(-6)
∆ = 1+24
∆= 25

x = [-b+/- √∆]/2a
x = [ -1 +/- √25]/2.1

x' = [-1+5]/2 = 4/2 = 2
x " =[-1-5]/2 = -6/2 = - 3

R.: (2 ; - 3)