Question

$(x^{2} +3x-1)^{2}-12x^{2}-36x+39=0$

Answer 1

x^4+9x^2+1+6x-12x^2-36x+39=0
(x-1)(x^3+7x^2+2x-40)=0
(x-1)(x-2)(x+5)(x+4)=0
x-1=0
x-2=0
x+5=0
x+4=0
x=-5,x=-4,x=1;x=2