Помогите сделать 187 и 188 плиз

№187
1) (x + 4)² - (x - 2)(x + 2) = 0
x² + 8x + 16 - x² + 4 = 0
8x = -20
x = -2,5

2) (2x - 5)² - (2x - 3)(2x + 3) = 0
4x² - 20x + 25 - 4x² + 9 = 0
-20x = -34
x = 1,7

3) (3x + 5)(3x - 5) - (3x - 1)² = 10
9x² - 25 - 9x² + 6x - 1 = 10
6x = 36
x = 6

4) 2(2x + 1)² - 8(x + 1)(x - 1) = 34
2(4x² + 4x + 1) - 8(x² - 1) = 34
8x² + 8x + 2 - 8x² + 8 = 34
8x = 24
x = 3