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by baratometer » Sat Nov 03, 2007 8:43 am
x^4 + y^4 > z^4 ?


1. x^2 + y^2 > z^4

2. x + y > z

Answer was E.

Can anyone explain?

I thought it should be D.
If you square statement 1, it would be:
x^4 + 2x^2y^2 + y^4 > z^4

So if you subtract a positive number (2x^2y^2) from z^4, shouldn't you be able to answer the question???
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Source: — Data Sufficiency |
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by raulverde » Sat Nov 03, 2007 4:46 pm
Plug in fractions for x , y and z. And you will get the answer.
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by ri2007 » Sat Nov 24, 2007 7:31 am
just use fractions e.g 0.2 + 0.3 > 0.4. Always remember to use fractions if it is not given that the number is an integer.
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