solve X to the power 15 + 1/ X to the power 25 when X + 1/X = 1
Last edited by sktulika; May 22nd 2008 at 10:43 PM.
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Originally Posted by sktulika solve X 15 +1/X 25 If X + 1/X =1 Does X 15 mean 15 X or X^15 .....? Does 1/X 25 mean 1/X^25, 1/(25 X) or 25/X .....? Much greater clarity is required.
Originally Posted by mr fantastic Does X 15 mean 15 X or X^15 .....? Does 1/X 25 mean 1/X^25, 1/(25 X) or 25/X .....? Much greater clarity is required. So you want to find the value of given that . A brutal approach: . Express the solution in polar form. . Substitute the polar form of x, use de Moivre's theorem and tidy up.
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