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March 27, 2017

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how do you solve this:

the square root of a+4 plus the square root of a-3 equals 7

  • pre-calc - ,

    sqrt (a+4) + sqrt (a-3)=7

    with seven on the right, the sqrt have to add to integers, which means each is an integer.

    So a has to be an integer, and a+4 and a-3 is an integer with a ingeter square root.

    Possible a:
    Start with 1, and see if a-4 and a-3 have integer square roots. It wont take you more than 20 seconds to find it.

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