help me pls in this question.....
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(a+b+c)(a+b-c)
=(a+b)²- c²
=a²+b²-c²+2ab
=(a+b)²- c²
=a²+b²-c²+2ab
Answered by
11
Step-by-step explanation:
(a+b+c)(a+b-c) = ((a+b)+c)((a+b)-c)....
so.. this is (x+y)(x-y) = x² - y²...
and here x = a+b
y =c ...
(a+b)² - c²
a²+b²+2ab-c ²....
answer... = a²+b²+2ab - c²
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