gmat powerprep

[roybudhaditya]

X^4+Y^4=100.then the greatest possible value of x could be--

1--0 & 3.
2--6 & 9.
3--12 & 15
4--3 & 6
5-9 & 12..

Any approach???

[Suyog]

is the question is complete?? if it is...

There are very few number which will have 'raise to 4' < 100.
As..

1, 1^4 = 1
2, 2^4 = 16
3, 3^4 = 81
and of cource 0

ans A

[kajcha]

I am lil confused.. Q is asking greatest possible value of x and there are 2 choices per option... you sure you typed the right question.

[Neo2000]

X^4+Y^4=100.then the greatest possible value of x could be--

1--0 & 3.
2--6 & 9.
3--12 & 15
4--3 & 6
5-9 & 12..

Any approach???

The greatest value of X will occur when Y = 0

Therefore you get X^4 = 100

3^4 = 81 so the required number has to lie between 3 and 4

The only answer option satisfying this is D