(a+6)(a-3)+(a-4)(a+5)

Question

(a+6)(a-3)+(a-4)(a+5)

Answer 1

   (a + 6)(a - 3) + (a - 4)(a + 5) = a² + 6a - 3a - 18 + a² - 4a + 5a - 20 =
= 2a² + 4a - 38 = 2(a² + 2a - 19)

Answer 2

(a2+3a-18)+(a2+a-20)=a2+3a-18+a2+a-20=2a2=4a-38

Comments

Последний знак равенства на плюс поменяйте..))