1,(x^2+3x+2)(4x^2+8x+3)-90
2,(x^2+4x+8)^2+3x(x^2+4x+8)+12x^2
3,6x^4+7x^3-36x^2-7x+6
4,(x^2+xy+y^2)-4xy(x^2+y^2)
5,(x^5+x^4+x^3+x^2+x+1)^2-x^5
1,(x^2+3x+2)(4x^2+8x+3)-90
2,(x^2+4x+8)^2+3x(x^2+4x+8)+12x^2
3,6x^4+7x^3-36x^2-7x+6
4,(x^2+xy+y^2)-4xy(x^2+y^2)
5,(x^5+x^4+x^3+x^2+x+1)^2-x^5
1,(x^2+3x+2)(4x^2+8x+3)-90
=(x+2)(x+1)(2x+3)(2x+1)-90
=[(x+2)(2x+1)(x+1)(2x+3)]-90
=(2x^2+5x+3)(2x^2+5x+2)-90
=(2x^2+5x)^2+5(2x^2+5x)+6-90
=(2x^2+5x)^2+5(2x^2+5x)-84
=(2x^2+5x+12)(2x^2+5x-7)
=(2x^2+5x+12)(x-1)(2x+7)