Question

simplify: (a+b+c) (a+b-c)​

Answer 1

Answer:

(a+b)² - c²

Step-by-step explanation:

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

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

(-ac and +ac and. - bc and +bc will cancle out)

=a² + 2ab + b² - c²

(As, (a+b) ² = a² + 2ab + b²)

=(a+b)² - c²