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(a + b)² = a² + b². If you expand the left side, you have a² + 2ab + b² = a² + b².

Subtracting a² and b² from both sides, you have: 2ab = 0. So if either a=0 or b=0 the equation is satisfied.

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Q: For what numbers is the following equation true a plus b squared is equal to a squared plus b squared?
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