Question

Achar as raizes das equaçao

Answer 1

x^2-x=20
x^2-x-20=0
delta=b^2-4ac
delta=(-1)^2-4.1.(-20)
delta=1+80
delta=81
x=-b-/+ raiz de delta/2a
x=-(-1)-9/2.1
x=1-9/2
x=-8/2
x=-4
x=-(-1)+9/2.1
x=1+9/2
x=10/2
x=5
S={-4, 5}