Question

Question : Simplify
$(a + b + c) ^{2} - (a - b - c )^{2}$
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Answer 1

Step-by-step explanation:

(a+b+c)²- (a-b-c)²

(a²+b²+c²+2ab+2bc+2ca)-(a²-b²-c²-2ab-2bc-2ca)

a²+b²+c²+2ab+2bc+2ca-a²+b²+c²+2ab+2bc+2ca

2b²+2c²+4ab+4bc+4ca