anonymous
  • anonymous
simplify (3a-4b^3)^3 Can anyone help me? Should it be 27a^3-64b^9? Mathway has some crazy answer...
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
no it is 27a^3 - 72a^2b^3 - 96ab^6 + 64b^9
anonymous
  • anonymous
how did you get the middle part? i don't get it.
anonymous
  • anonymous
did you use foil and do the equation times itself then foil again for the 3rd time?

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anonymous
  • anonymous
cubic expansion is a^3 + a^2b + b^2a + b^3 for ( a + b ) ^ 3 its different from squaring
anonymous
  • anonymous
ok- thanks.
anonymous
  • anonymous
what you have as the "should be " answer
anonymous
  • anonymous
is the expansion of ( 3a)^3 - (4b^3)^3
anonymous
  • anonymous
is that correct though? if i was just asked to simplify?
anonymous
  • anonymous
= (3a - 4b^3)( 9a^2 +12ab^3 + 16b^6)
anonymous
  • anonymous
ahh ignore what I wrote above lol , I thought you meant that was the answer the textbook had
anonymous
  • anonymous
no, that was my answer. i see- so it is wrong.
anonymous
  • anonymous
well, I am guessing they said expand and simplify, because something factor is alot more simple than a messy cubic expansion
anonymous
  • anonymous
it is just a post i have to answer...simplify and then the equation.
anonymous
  • anonymous
i will write what i thought- seems a lot simpler than your way :)

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