1.

Multiply together:1. a+b+c, a+b-c.​

Answer»

Let (b + c) = x Then (a + b + c) ^{2} = (a + x) {}^{2} = a {}^{2} + 2ax + x { }^{2} = a {}^{2} + 2a (b + c) + (b + c) {}^{2} = a {}^{2} + 2ab + 2ac + (b {}^{2} + c {}^{2} + 2bc) = a {}^{2} + b {}^{2} + c {}^{2} + 2ab + 2bc + 2caTherefore, (a + b + c) {}^{2} = a {}^{2} + b {}^{2} + c {}^{2} + 2ab + 2bc + 2ca


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