Question

x-4x-5=0 equacao do 2 grau

Answer 1

∆=b2-4.a.c
∆=(-4)2-4.1.(-5)
∆=16+20
∆=36
x=(-b+√∆)/2.a
x=(4+6)/2
x'=10/2=5
x"=-2/2=-1