Bài 1
a, 2x^3-4x^2+2x=2x(x^2-2x+1)
=2x(x-1)^2
b, x^2-7x-30=x^2-10x+3x-30
=x(x-10)+3(x-10)
=(x-10)(x+3)
Bài 2
a, x(x+3)-2x-6=0 b, 4x^2-1+x(2x-1)=0
x(x+3)-2(x+3)=0 (2x-1)(2x+1)+x(2x-1)=0
(x+3)(x-2)=0 (2x-1)(2x+1+x)=0
Hoặc x+3=0 (2x-1)(3x+1)=0
x-2=0 Hoặc 2x-1=0 Hoặc 2x=1 Hoặc x=1/2
Hoặc x=-3 3x+1=0 3x=-1 x=-1/3
x=2