Question

Simplify
(i) (a + b + c)2 – (a + b – c)2
2
ha​

Answer 1

Answer:

expand (a+b+c)2 :a2+b2+c2+2(ab+bc+ca)

expand (a+b-c)2: a2+b2+c2+2(ab-bc-ca)

and then evaluate by removinh brackets and subtracting