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8 September, 18:55

Thirty times the square of a non-zero number is equal to eight times the number. what is the number?

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Answers (2)
  1. 8 September, 20:43
    0
    Hello,

    let x the unknowed number,

    30*x²=8*x

    ==> 30x=8 (for x ≠0)

    ==>x=8/30

    ==>x=4/15

    Confusion dans la traduction mentale désolé.
  2. 8 September, 22:00
    0
    You said that 30 x² = 8 x

    I can divide

    each side by 'x': 30 x = 8

    Then divide

    each side by 30: x = 8 / 30 = 4/15.

    Check to see if it works:

    Does 30 (4/15) ² = 8 (4/15) ?

    Well, (4/15) ² = 16/225

    30 · 16/225 = 480/225 = 32/15

    and

    8 · 4/15 = 32/15 yay!
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