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Bob says that (x + y) 2 = x^(2) + y^(2) is a shortcut rule of multiplication while Joe says that it doesn't work. Show

Bob says that (x + y)2 = x^(2) + y^(2) is a shortcut rule of multiplication while Joe says that it doesn't work. Show who is correct by giving at least two different explanations (numeric, geometric, algebraic, etc. ) to support your conclusion.

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