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2 March, 19:55

One number is 2 more than another. The difference between their squares is 20. What are the numbers?

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  1. 2 March, 20:07
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    let x=one number =

    x-2 = another number

    x² - (x-2) ²=20

    x²-x²-4x+4=20

    -4x=20-4

    -4x=16

    x=16/-4

    x=-4

    one number is - 4

    x-2

    -4-2

    =-6

    the another number is - 6
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