Question

: (a+b+c) (a+b-c) - 2ab​

Answer 1

Answer:

a²+b²-c² +2abc......

Step-by-step explanation:

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Answer 2

Answer:

( a+ b+c)(a + b- c) - 2ab

a^2 + ab - ac + b^2 + ab - bc - c^2 + ac + bc - 2 ab

a^2 +b^2 - c^2 is your answer.

Hope it will help you.