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28 March, 22:44

If xy=15 and x+y=5, find x^2+y^2

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  1. 28 March, 23:03
    0
    - 5

    Step-by-step explanation:

    Note that

    (x + y) ² = x² + 2xy + y², thus

    x² + y² = (x + y) ² - 2xy ← substitute given values

    = 5² - 2 (15)

    = 25 - 30

    = - 5
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