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baratometer
- Newbie | Next Rank: 10 Posts
- Posts: 6
- Joined: Wed Jul 04, 2007 6:44 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???
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???
