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30 April, 03:24

If a^2+b^2+c^2=169. find a, given that b=2√2, 3√c=9.

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  1. 30 April, 03:29
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    a = ±4√5

    Step-by-step explanation:

    Solve for c.

    3√c = 9

    √c = 9/3

    √c = 3

    c = 3²

    c = 9

    Put b=2√2 and c=9, solve for a.

    a² + (2√2) ² + 9² = 169

    a² + 8 + 81 = 169

    a² = 169 - 81 - 8

    a² = 80

    a = ±√80

    a = ±4√5
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