Question

a-2b+c,a+2b-c multiply​

Answer 1

Answer:

(a - 2b + c)( a + 2b - c)

= a(a + 2b - c) - 2b(a + 2b - c) + c(a + 2b - c)

= a² + 2ab - ac - 2ab - 4b² + 2bc + ac + 2ab - c²

= a² + (2ab - 2ab + 2ab) + ( -ac + ac) - 4b² - c²

= a² + 2ab - 4b² - c²