Question

(7а+2в)-(3а-в)(4а+5в)

Answer 1

$7a + 2b - (3a - b)(4a + 5b) = 7a + 2b - (12 {a}^{2} + 15ab - 4ab - 5 {b}^{2} ) = 7a + 2b - 12 {a}^{2} - 11ab + 5 {b}^{2} = - 12 {a}^{2} + 5 {b}^{2} - 11ab + 7a + 2b$

Answer 2

7a+6b-11ab+15b^2 вот ответ