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13 February, 21:55

The difference between the solutions to the equation x^2=a is 30. What is a? Show that your answer is correct.

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  1. 13 February, 21:58
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    solution:

    x˄2 = a ⇒ x = ±√a

    The difference between the solutions is

    √a - (-√a) = 2√a = 30 ⇒ √a = 15

    Therefore,

    a = 225.
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