anonymous
  • anonymous
x^3-729 factor the difference of the two cubes
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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amistre64
  • amistre64
(a^3 - b^3) (a-b)(a^2-ab+b^2) ?
anonymous
  • anonymous
i am lost
amistre64
  • amistre64
what is the cuberoot of 729?

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anonymous
  • anonymous
ummm
amistre64
  • amistre64
9....got it; (x-9)(x^2 +9x +81) or is it... (x-9)(x^2 -9x +81) one or the other, I forget which :)
myininaya
  • myininaya
its the first one
amistre64
  • amistre64
hey... i just figured that out :)
myininaya
  • myininaya
a^3+b^3=(a+b)(a^2-ab+b^2) and a^3-b^3=(a-b)(a^2+ab+b^2)
amistre64
  • amistre64
yep.... learned it like 4 semesters ago and havent used it since :/
myininaya
  • myininaya
i always remember that is one or the other, but then i think if i set this =0 and solve for x, I would get x=9 so one of the factors is x-9 since x-9=0

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