fthelusca fthelusca
  • 20-07-2017
  • Mathematics
contestada

Solve x3 = 64 over 27.

±8 over 3
8 over 3
±4 over 3

Respuesta :

Nick911 Nick911
  • 20-07-2017
x³=64/27
Cube root the answer
³√x³=³√64/27
x=4/3.
Check:
x=4/3
x³=(4/3)³
x³=64/27. As a result, the correct answer is 4/3 or 4 over 3. If you wonder why don't I choose the answer as ±4 over 3 because of this
±4/3
Choose positive first
(4/3)²=64/27 Correct. However, then choose negative signs
(-4/3)³=-64/27 Incorrect. Hope it help!
Answer Link
choixongdong
choixongdong choixongdong
  • 20-07-2017
x^3 = 64/27
x^3 = (4/3)^3
x = +- (4/3)

answer is 
±4 over 3
Answer Link

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