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tcarroll010Best ResponseYou've already chosen the best response.1
Start with the realization that this is the difference between 2 perfect squares. And when you have a^3  b^3, this can be factored into (a  b)(a^2 + ab + b^2)
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
Sorry, just saw the plus sign.
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
It is the SUM of 2 perfect squares, which can be factored. a^3 + b^3 = (a + b)(a^2  ab + b^2).
 one year ago

ThailynnBest ResponseYou've already chosen the best response.0
Google it or yahoo it . http://answers.yahoo.com/question/index?qid=20110601120209AAC6qWn
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
So, 27x^3 + 125 = 0 > (3x)^3 + 5^3 = 0 and you can use my formula (second post) and you can find the first zero.
 one year ago

heathernellyBest ResponseYou've already chosen the best response.0
oh okaay, thank you very muchh :)
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
(3x)^3 + 5^3 = 0 = (3x + 5)(9x^2  15x + 25)
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
You will have one real zero at x = 5/3 and 2 imaginary zeros that come from the second factor. Just use the quadratic formula.
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
You are very welcome!
 one year ago
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