if xsquared+ysquared=57 , xy=3 . find the value of 3(x+y)squared

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if xsquared+ysquared=57 , xy=3 . find the value of 3(x+y)squared

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Minh Khuê 5 years 2021-08-15T18:19:28+00:00 1 Answers 15 views 0

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  1. diemkieu
    0
    2021-08-15T18:20:31+00:00
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    Answer:

    189

    Step-by-step explanation:

    If you mean this, my answer is 3×63= 189

    {x}^{2} + {y}^{2} = 57 \\ xy = 3

    {x}^{2} + {y}^{2} + 2xy = 57 + 2 \times 3

    {(x + y)}^{2} = 63

    3 {(x + y)}^{2} = 3 \times 63 = 189

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