Q : 3     Simplify.

            (viii) (a+b+c)(a+b-c)

Answers (1)

(a + b + c) X (a + b - c)  = a  X (a + b - c) + b  X (a + b - c) + c  X (a + b - c)
                                       = a^{2} + ab - ac + ab + b^{2} -bc + ac + bc - c^{2}
                                       = a^{2} + b^{2}  - c^{2} + 2ab 

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