Tìm x (x + 1)(x + 3) – x(x + 2)= 7

Tìm x

1.       (x +1)(x +3) – x(x+2)= 7

2.       (4-x)2 –(3x+ 2)2 = 0

3.       8x2+ 30x+ 7= 0

4.       (x-1) (x+2)= x+ 2

5.       (3x + 2) ( 3x -2)- (3x -1)2=5