(х-1)(х2+6х+9)=5(х+3)

Question

(х-1)(х2+6х+9)=5(х+3)

Answer 1

(x-1)(x+3)²-5(x+3)=0
(x+3)(x²+2x-3-5)=0
(x+3)(x²+2x-8)=0
x+3=0⇒x=-3
x²+2x-8=0
x1+x2=-2 U x1*x2=-8
x1=-4 U x2=2
x={-3;-4;2}