Đáp án:
Giải thích các bước giải:
1) (x^2+5x)^2=2x^2+10x+24
⇔(x^2+5x)^2=2x(x+5)+24
⇔x(x+5)^2=2x(x+5)+24
⇔x(x+5)^2-2x(x+5)=24
⇔(x+5)(x^2+5x-2x)-24=0
⇔(x+5)x(x+3)-24=0
⇔(x+5)(x+3)(x-24)=0
⇔x+5=0 x=-5
x+3=0 ⇔ x=-3
x-24=0 x=24
2) x^2+x-xy-2y^2-2y= x^2(x-xy)-(2y^2+2y)
=x^2(1-y)-2y(y+1)
=(y+1)(x^2-2y)