tough one

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tough one

by sana.noor » Sun May 05, 2013 9:59 am
If z is an integer, is 4^z + 1/(4^z) = p?
(1) 2^z + 1/(2^z) = square root (p+2)
(2) z is positive.

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Last edited by sana.noor on Sun May 05, 2013 6:16 pm, edited 2 times in total.
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by killerdrummer » Sun May 05, 2013 10:29 am
Hey Sana.noor
If z is an integer, is 4z + 1
4z = p?
Can you please write it concisely as I am unable to understand what we want to prove in this question.


Thanks in advance!!!
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by Brent@GMATPrepNow » Sun May 05, 2013 10:34 am
sana.noor wrote:If z is an integer, is 4z + 1
4z = p?
(1) 2^z + 1/2^z = square root (p+2)
(2) z is positive.

A[/list]
Also, when you use exponents with fractions, be sure to include brackets to prevent ambiguity.
Do you mean for 1/2^z to equal (1/2)^z or 1/(2^z)?

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