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31 January, 04:20

If x is a whole number and 437 = (21 + x) (21 - x), then x = a0

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Answers (2)
  1. 31 January, 04:22
    0
    (21 + x) (21 - x) = 437

    21² - x² = 437

    441 - x² = 437

    - x² = 437 - 441

    - x² = - 4

    (-1) (-x²) = (-1) (-4)

    x² = 4

    So, x = 2
  2. 31 January, 04:47
    0
    Factor 437=19*23

    Therefore (437) = 19*23 = (21-2) (21+2) = > x=2
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