4x - 14 - [10x² - 6x - (4 + 8x - x²)] =
4x - 14 - [10x² - 6x - 4 + 8x - x²] =
4x - 14 - [9x² + 2x -4] =
4x - 14 - 9x² - 2x + 4 =
2x - 10 - 9x² =
-9x² + 2x - 10
9x² - 13x - [ 3 - 9x - (4 - 8x - 2x²) ] =
9x² - 13x - [3 - 9x - 4 - 8x +8x + 2x²] =
9x² - 13x - [-1 - 17x + 2x²] =
9x² - 13x + 1 + 17x - 2x² =
7x² + 4x + 1
