algebra

Which are the solutions of 18x^3=50x?

A. 0,5/3
B. -5/3,5/3
C. -5/3,0,5/3
D. -5/3,1,5/3

I don't know how to get the answer.

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asked by Jessica
  1. 18x^3 - 50x = 0
    x(18x^2 - 50) = 0
    x = 0 or x^2 = 50/18 = 25/9

    so x=0 or x= ±5/3

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    posted by Reiny
  2. I don't understand how you get x^2=50/18

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    posted by Jessica
  3. from
    x(18x^2 - 50) = 0

    x = 0 or 18x^2 - 50 = 0

    18x^2 = 50 now divide both sides by 18

    x^2 = 50/18 which reduces to 25/9

    x^2 = 25/9

    From there I got my final answer by taking the square root of both sides

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    posted by Reiny

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