Question

простите вырожение
$(a + 3) times (5 - a) - 2a$

Answer 1

$(a + 3)(5 - a) - 2a = 5a - {a}^{2} + 15 - 3a - 2a = - {a}^{2} + 15 =$

Answer 2

(a+3)(5-a)-2a= 5a+15-a²-3a-2a= -a²+15