Question

encontre as raizes da equaçao x²-4x-5=0

Answer 1

-4*+4×1×(-5)
-16-20
-36
raiz de 36=6

Answer 2

Δ = (-4)² - 4.(1).(-5)
Δ= 16+20
Δ=36

x1= -(-4)+√36/2
x1=4+6/2
x1= 5

x2= -(-4)-√36/2
x2= +4-6/2
x2=-1