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Explain in your own words why (x+y) 2 = x2 + y2. provide a numerical example to illustrate

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  1. 17 May, 14:20
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    (x + y) ² = x² + y²

    (x + y) (x + y) = x² + y²

    x² + xy + xy + y² = x² + y²

    x² + 2xy + y² = x² + y²

    - x² - x²

    2xy + y² = y²

    - y² - y²

    2xy = 0

    2 2

    xy = 0
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