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22 August, 10:12

Solve this problem as a quadratic equation. The difference between two positive numbers is 5. Their product is 104 find the numbers.

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  1. 22 August, 10:31
    0
    Let's call the smaller number x:

    y-x=5

    xy=104

    y-x=5 can be rewritten as y=x+5

    Substituting this into the second equation gives:

    x (x+5) = 104

    x^2+5x=104

    x^2+5x-104=0

    Then simply solve as a quadratic:

    x^2+13x-8x-104=0

    x (x+13) - 8 (x+13) = 0

    (x-8) (x+13) = 0

    x=8,-13

    the question said the numbers are positive, so x=8

    if x=8,

    y=x+5

    y=13

    So the two numbers are 8 and 13.
  2. 22 August, 10:51
    0
    The best way to do this is to find the factors of 104. For this I got 1, 2, 4, 8, 13, 26, 52 and 104. From this, you are then able to look at the two that have a difference of five, which in this case, is 8 and 13. You should then double check that when these are multipled, they are equal to 104, which they are. I'm not 100% sure if this is the answer that you are looking for, but the two numbers are 8 and 13
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