Question

Теңдеуді шеш: (4a + 5)(a – 4) – (2a + 3)(2a – 6) = –3a.

Answer 1

$(4a + 5)(a - 4) - (2a + 3)(2a - 6) = -3a\\4a^2-16a+5a-20-(4a^2-12a+6a-18)=-3a\\4a^2-11a-20-4a^2+6a+18=-3a\\-5a-2=-3a\\-5a+3a=2\\-2a=2\\a=-1$