Question

1) Encontre as raízes das equacoes :

A) X2- 2x - 8=0

Answer 1

X2- 2x - 8=0
a=1     b=-2      c=-8
Δ=b2-4ac
Δ=(-2*-2)-4*1*(-8)
Δ=4+32
Δ=36

x=-b+-√Δ/2a
x=-(-2)+-√36/2
x=2+-6/2

xi= 2+6/2= 8/2=4
xii= 2-6/2= 4/2=2