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PS question on GMAT PREP Practice Test 2

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Newbie | Next Rank: 10 Posts
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PS question on GMAT PREP Practice Test 2

by davisasialene » Thu Jun 26, 2008 10:59 pm
For some reason, this question isn't clicking for me. It must be super easy, but I'm just not seeing my error.

Is x^4 + y^4 > z^4?

(1) x^2 + y^2 > z^2

(2) x + y > z

I understand that (2) is insufficient because x and y could be negative numbers, but why isn't (1) sufficient?
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Master | Next Rank: 500 Posts
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Re: PS question on GMAT PREP Practice Test 2

by atlantic » Thu Jun 26, 2008 11:06 pm
davisasialene wrote:For some reason, this question isn't clicking for me. It must be super easy, but I'm just not seeing my error.

Is x^4 + y^4 > z^4?

(1) x^2 + y^2 > z^2

(2) x + y > z

I understand that (2) is insufficient because x and y could be negative numbers, but why isn't (1) sufficient?
This Q is anything but easy and It was several times discussed here. Last time with insights from Ian.

Here is the link https://www.beatthegmat.com/data-suffici ... 12814.html

Hope it helps.
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