A) 2X(X -5) - X(3+2X) = 26 B) (4X - 1)(X + 3) – (2X - 1)2 = 0 C) 5X(X-1) = X – 1 D) 2(X+5) - X2 - 5X = 0 E) (2X -3)2 - (X+5)2 = 0 G) 3X3 - 48X = 0 H) X2 – 6X = - 9 I) X2 – X – 6 = 0

Bài 5. Tìm x biết:

a) 2x(x -5) - x(3+2x) = 26 b) (4x - 1)(x + 3) – (2x - 1)

2

= 0 c) 5x(x-1) = x – 1

d) 2(x+5) - x

2

- 5x = 0 e) (2x -3)

2

- (x+5)

2

= 0 g) 3x

3

- 48x = 0

h) x

2

– 6x = - 9 i) x

2

– x – 6 = 0