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5 June, 07:43

What number when multiplied by itself is 23 greater than the preceding number when it is multiplied by itself?

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Answers (2)
  1. 5 June, 10:06
    0
    12.

    12^2 = 144

    11^2 = 121

    144 - 121 = 23
  2. 5 June, 10:45
    0
    X²=23 + (x-1) ²

    expand

    x²=23+x²-2x+1

    x²=x²-2x+24

    minus x² both sides

    0=-2x+24

    add 2x both sides

    2x=24

    divide by 2

    x=12

    the number is 12
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