Question

Помогите пожалуйста ​

Answer 1

16.

$16 - (a - c) {}^{2} = (4 - (a - c)) \times (4 + (a - c)) = (4 - a + c) \times (4 + a - c)$

17.

$y^{2} - (2 - 3y)^{2} = (y - (2 - 3y)) \times ( y + (2 - 3y)) = (y - 2 + 3y) \times (y + 2 - 3y) = (4y - 2) \times ( - 2y + 2) = 2 \times (2y - 1) \times ( - 2 \times (y - 1) = - 4(2y - 1) \times (y - 1)$