TÌM X (1,5Đ) A) (X – 2) (X + 2) – X (X – 3) = 5 B) X2 – 9X + 20 = 0...

Bài 3: Tìm x (1,5đ)

a) (x – 2) (x + 2) – x (x – 3) = 5

b) x

2

– 9x + 20 = 0