Bài 1. Phân tích các đa thức sau thành nhân tử: 1) 2x(x – y) – 2x + 2y
2) x2 – y2- 2x + 1
3) 3x(x – 1) – 2(1 – x)
4) 4x(x – 2) – x2 + 4
5) 2(x – y)2 – 3(y – x)
Bài 2. Tìm x, biết:
1) –x(x - 3) + (x – 2)2 = 0
2) 2x(x – 5) –x + 5 = 0
3) (2x – 1)(4x2 + 2x +1) – 8x(x – 1)(x + 1)=0 4) 4x(x – 7) = x – 7
10) 6x2 – 11x – 2 = 0
6) -2x2-6x – 4
7) x2 – 10x + 9
8) 2x2-2x - 12
9) 16x4 + 4
10) (x + 1)(x + 2)(x + 3)(x + 4) +1