Question

x²-4x =5
Qual a resposta?

Answer 1

a=1, b=-4, c=-5
Δ=(-4)²-4.1.(-5)=16+20=36
x=-(-4)+-(rqrt36)/2.1
x=4+-6/2
x1=10/2=5
x2=-2/2=-1
S.{5,-1}