Question

resolva a equação:

x³+3x²-4x-12=0

Answer 1

x²+3x²-4x-12=0
4x²-4x-12=0
d=(-4)²-4.4.(-12)
d=16+192
d=208
x=-b±√d/2a
x=-(-4)±√208/2.4
x'=4+208/8=53/2
x"=4-208/8=-51/2
S={-51/2, 53/2}