Question

помогите, пожалуйста ​

Answer 1

Ответ:

$(x + 6y)(6y - x) = 6xy + 36y {}^{2} - x {}^{2} - 6xy = 36y {}^{2} - x {}^{2} \\ 2a(4a +3) - (3a + 1) {}^{2} = 8a {}^{2} + 6a - (9a {}^{2} + 6a + 1) = 8a {}^{2} + 6a - 9a {}^{2} - 6a - 1 = - a {}^{2} - 1$