Đáp án+Giải thích các bước giải:

 `a. (3x - 5)^2 - (3x + 1)^2 = 8`

`=> (3x - 5 - 3x - 1)(3x - 5 + 3x + 1) = 8`

`=> -6.(6x - 4) = 8`

`=> 6x - 4 = -4/3`

`=> 6x = 8/3`

`=> x = 4/9`.

`b. 2x(8x - 3) - (4x - 3)^2 = 27`

`=> 16x^2 - 6x - 16x^2 + 24x - 9 = 27`

`=> 16x^2 - 6x - 16x^2 + 26x = 27 + 9`

`=> 20x = 36`

`=> x = 9/5`.

`c. (x + 5)^2 - x^2 = 45`

`=> (x + 5 - x)(x + 5 + x) = 45`

`=> 5(2x + 5) = 45`

`=> 2x + 5 = 9`

`=> 2x = 4`

`=> x = 2`.

`d. (2x - 3)^2 - (2x + 1)^2 = -3`

`=> (2x - 3 - 2x - 1)(2x - 3 + 2x + 1) = -3`

`=> -4.(4x - 2) = -3`

`=> 4x - 2 = 3/4`

`=> 4x = 11/4`

`=> x = 11/16`.