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Re: If r = 0.345, s = (0.345)^2, and t = sqrt(0.345) , which of [#permalink]

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28 Aug 2011, 07:29

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petrifiedbutstanding wrote:

Can someone provide a good solution to this? This problem is pretty straightforward, but I'd definitely be confused if it got a lil more complex on the real GMAT... Any help will be greatly appreciated.

For, 0<x<1; the higher power of x always be smaller than lower power of x.

For x<0; it gets subtle because all even powers become +ve. Try some examples and see what you get. But, there too: consider 0>x>-1; x=-1; -1>x as three separate case.
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Re: If r = 0.345, s = (0.345)^2, and t = sqrt(0.345) , which of [#permalink]

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26 Jul 2012, 03:58

Hi bunuel,

thanks for that example. I had solved it by keeping the fraction itself.

Thanks
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Simplify the value of a to -0.3. So, b= 0.09 c = -0.027 d = 0.0081

So, the correct order will be Option C:

c<a<d<b

A Tip!

If a had been a difficult number like, say a= -0.784, then instead of simplifying it by rounding it off to -0.8, I suggest you simply take an easier negative decimal, say -0.2, and calculate the relationship between a,b,c,d for it. That relationship would hold true for any negative decimal between 0 and -1. This tip will save you time because calculating the cube and fourth power of 0.8 will be time-consuming.
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Last edited by JapinderKaur on 22 May 2014, 04:25, edited 1 time in total.