Question

factorise (a+b+c) (a+b-c)​

Answer 1

Step-by-step explanation:

$((a + b) + c)((a + b) - c)$

Using identity we get

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