Question

(x+4)(x-1)=5x+20 qual as raizes

Answer 1

x²-x-4+4x=5x+20
x²-2x-24=0
a=1 b=-2 c=-24
∆=b²-4ac
∆=4-4×1×(-24)
∆=4+96=100
√100=10
x=-b±√∆/2a
x=2±10/2
x'=6
x"=-4