Question

(x^2+2x)(x^2+2x-2)=3

Answer 1

t=x^2+2x

t(t-2)-3=0

t^2-2t-3=0

t1=3

t2=-1

x^2+2x+1=0

x=-1

x^2+2x-3=0

x=-3

x=-1