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Why is (a - b)² = (a - b)(a - b) but NOT equal to (a + b)(a - b)?

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Why is (a - b)² = (a - b)(a - b) but NOT equal to (a + b)(a - b)?

Why is (a - b)² = (a - b)(a - b) but NOT equal to (a + b)(a - b)?

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