Question

simplify (a+b+c) (a+b-c)​

Answer 1

Step-by-step explanation:

$({a + b})^{2} - ({c})^{2}$

Answer 2

Step-by-step explanation:

a^2+ab+ac+b^2+ab+bc+c^2+ac+bc

=2ab+2ac+2bc+a^2+b^2+c^2