help solve problem: solve 27 u^3 + 64

rcdebro506 said:
help solve 27 u^3 + 64
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Without knowing what 27 u<sup>3</sup> + 64 is equal to, there is no way to solve for the value of the variable "u". Sorry. :oops:

Eliz.

P.S. Welcome to FreeMathHelp! :D
 
the pattern for factoring the sum of two cubes may help ...

a<sup>3</sup> + b<sup>3</sup> = (a + b)(a<sup>2</sup> - ab + b<sup>2</sup>)

also, it's good to also know the factoring pattern for the difference of two cubes ...

a<sup>3</sup> - b<sup>3</sup> = (a - b)(a<sup>2</sup> + ab + b<sup>2</sup>)

... learn them both.
 
rcdebro506 said:
i can't put an equal sign after the 64
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I'm sorry, but I don't understand what this means. Are you saying that your keyboard doesn't have an "equals" character on it? If so, then just type out "equals" and then put whatever is on the other side.

Or did you mean that the instructions were not to "solve", but to "factor fully", or something similar?

Please reply with clarification. Thank you! :D

Eliz.
 
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