Q

# Simplify. (a + b + c)(a + b – c)

Q : 3     Simplify.

(viii) $(a+b+c)(a+b-c)$

= $a^{2}$ + ab - ac + ab + $b^{2}$ -bc + ac + bc - $c^{2}$
= $a^{2}$ + $b^{2}$  - $c^{2}$ + 2ab