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March 29, 2017

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If √ax²-b=c and a=2, b=7, and e=5, find X

  • Math - ,

    sqrt(ax^2 - b) = c,
    sqrt(2x^2 - 7) = 5,
    Square both sides:
    2x^2 - 7 = 25,
    2x^2 = 25 + 7,
    2x^2 = 32,
    x^2 = 32 /2 = 16,
    Take sqrt of both sides and get:
    x = +- 4.

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