anonymous
  • anonymous
Solve x3 = 64 over 27. ±8 over 3 8 over 3 ±4 over 3 4 over 3
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
@phi
phi
  • phi
you could check your answer choices
anonymous
  • anonymous
this isnt the one that needs checking

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More answers

phi
  • phi
x^3 means x*x*x so you could check if the answer times itself 3 times gives 64/27
phi
  • phi
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"
phi
  • phi
the other way to answer the question is to "solve for x" but that involves finding cube roots.
anonymous
  • anonymous
hmmm
anonymous
  • anonymous
let me look rlly fast
anonymous
  • anonymous
im not sure
phi
  • phi
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
anonymous
  • anonymous
512/27?
anonymous
  • anonymous
@phi is that it
phi
  • phi
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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