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anonymous

  • one year ago

Solve x3 = 64 over 27. ±8 over 3 8 over 3 ±4 over 3 4 over 3

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  1. anonymous
    • one year ago
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    @phi

  2. phi
    • one year ago
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    you could check your answer choices

  3. anonymous
    • one year ago
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    this isnt the one that needs checking

  4. phi
    • one year ago
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    x^3 means x*x*x so you could check if the answer times itself 3 times gives 64/27

  5. phi
    • one year ago
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    I am suggesting a way to decide what the answer is. one way is to check each of the 4 possible answers. only one of them should "work"

  6. phi
    • one year ago
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    the other way to answer the question is to "solve for x" but that involves finding cube roots.

  7. anonymous
    • one year ago
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    hmmm

  8. anonymous
    • one year ago
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    let me look rlly fast

  9. anonymous
    • one year ago
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    im not sure

  10. phi
    • one year ago
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    let's test x= 8/3 what is \[ \frac{8}{3} \cdot \frac{8}{3} \cdot \frac{8}{3} \] multiply top times top and bottom times bottom

  11. anonymous
    • one year ago
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    512/27?

  12. anonymous
    • one year ago
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    @phi is that it

  13. phi
    • one year ago
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    yes and 512/27 is not 64/27 in other words, 8/3 (and also -8/3) is not the answer the other two choices are 4/3 and \(\pm\) 4/3 the only difference is the second choice includes -4/3 but -4/3 * -4/3 * -4/3= -64/27 it is negative and we want +64/27 that means the only answer that works is 4/3

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