ответы ниже!
Пошаговое объяснение:
#1
1. (4y - 3x) (4y + 3x) = 16y^2 - 9x^2
2. 100x^2 - 4y^2 = (10x - 2y) (10x + 2y)
3. (3x +y)^2 = 9x^2 + 6xy + y^2
4. (6a - 9c)^2 = 36a^2 - 108ac + 81c^2
#2
(2x + 3)^2 - 4 (x - 1) ( x+ 1) = 49
4x^2 + 12x + 9 - 4x^2 + 4 = 49
12x + 13 = 49
12x = 36
x = 3
