anonymous
  • anonymous
cubed root of (-8x^9).... I have -2x^?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
|dw:1327286055825:dw|
anonymous
  • anonymous
(-8x^9)^1/3 =-2x^3
anonymous
  • anonymous
so you just take the square root of the nine

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anonymous
  • anonymous
take the cube root of -8 that is -2 and the x power of 9 divided by 1/3 power=3
anonymous
  • anonymous
oh ok thank you
anonymous
  • anonymous
i mean multiplied by 1/3 or divided by 3
anonymous
  • anonymous
yw
anonymous
  • anonymous
so what do you do if it says the cubed root of say 2? what is that then?
anonymous
  • anonymous
ok cube root of 2=2^(1/3) if you use a calculator =1.2599
anonymous
  • anonymous
ok thanks I'm not really sure how to do this hw I have lol so Im just trying to piece it all together thank you!
anonymous
  • anonymous
|dw:1327286991080:dw|
anonymous
  • anonymous
1.2599(1,2599)(1.2599)=1.2599^3 =2
anonymous
  • anonymous
|dw:1327287288675:dw|
anonymous
  • anonymous
a god example is cube root of -8 that is (-8)^1/3=-2 to check this (-2)x(-2)x(-2)=-8
anonymous
  • anonymous
(-2)(-2)(-2)= (-2)^3=-8 this is a cubed of -2,,, now its reversed is the cube root cube root of -8=(-8)^(1/3) =-2
anonymous
  • anonymous
if (-b)^1/3=-a then (-a)^3=-b
anonymous
  • anonymous
right ok
anonymous
  • anonymous
algebraically,,,,if (-b)^1/3=-a here lets put both sides to the power of 3 [ (-b)^1/3 ]^3=[-a]^3 [ (-b)^3/3 ]=[-a]^3 [ (-b)^1 ]=[-a]^3
anonymous
  • anonymous
good luck now

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