(a+b+c)(a+b-c) Please Help
Sivatmika:
a^2 - b^2 - c^2
sorry sorry between a^2 and b^2 is plus
I got this
when I used a^2 - b^2 identity
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(a+b+c)(a+b-c)
= a(a+b-c) +b(a+b-c) +c(a+b-c)
= a²+ab-ac+ab+b²-bc+ac+cb-c²
= a²+b²-c²+2ab
cut 2ab
otherwise everything is correct
but the method is wrong
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