Question

Упростить (3a-b)(a+b)+(b-3a)=

Answer 1

(3a-b)(a+b)+(b-3a)=3a²+3ab-ab-b²+b-3a=3a²+2ab-3a+b-b²

Answer 2

(3a - b) * (a + b) + (b - 3a) = 3a² + 3ab - ba - b² + b - 3a = (3a² + 3ab - 3a) - (ba + b² - b) = 3a * (a + b - 1) - b * (a + b - 1) = (a + b - 1) * (3a - b)