Question

find (a+b+c) (a+b-c)​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

(a+b)²-c²

Step-by-step explanation:

METHOD—1

(a+b+c)(a+b-c)

a²+ab-ac+ab+b²-bc+ac+bc-c²

after cancellation we get,

a²+b²-c²+2ab

(a+b)²-c²

METHOD—2

(a+b+c)(a+b-c)

((a+b)+c)((a+b)-c) [ since, (a+b)(a-b) = a²-b² ]

(a+b)²-c²