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# If x^4 + y^4 = 100, then the greatest possible value of x is

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If x^4 + y^4 = 100, then the greatest possible value of x is [#permalink]  23 Oct 2005, 10:15
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If x^4 + y^4 = 100, then the greatest possible value of x is between:

A. 0 and 3
B. 3 and 6
C. 6 and 9
D. 9 and 12
E. 12 and 15

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-x-4-y-4-100-then-the-greatest-possible-value-of-x-is-128171.html
[Reveal] Spoiler: OA

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-Vikram

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Director
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[#permalink]  23 Oct 2005, 10:19
is it 1) 0 to 3
used some crude reasoning! Don't want to be with an incorrect explanation for a wrong pick!
Manager
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[#permalink]  23 Oct 2005, 10:19
is there some trick I am missing?

minimize y, i.e. y=0

then x can be 3 because 3*3*3*3<100
and I guess 3.000001 would work as well but 4 is already +100.
SVP
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Re: PS: from gmatprep [#permalink]  23 Oct 2005, 10:19
B. x is greatest when y is zero. so 3<x<4.
VP
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[#permalink]  23 Oct 2005, 10:20
greatest possible value of x is when y is 0. 3^4=81. 4^4>100. that means x must be slightly greater than 3. thats 2) !
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If your mind can conceive it and your heart can believe it, have faith that you can achieve it.

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[#permalink]  23 Oct 2005, 10:25
gsr wrote:
is it 1) 0 to 3
used some crude reasoning! Don't want to be with an incorrect explanation for a wrong pick!

I am sorry. I meant B.
I thought of it as a circle with radius = 10
X^2 + Y^2 = 10^2 where X = x^2
So x^2 = 10 for max value of x.(from 0,0) => x>3 & <4
Senior Manager
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[#permalink]  23 Oct 2005, 10:26
Yes OA is B.

DOH!! I made a real silly mistake on this one....
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-Vikram

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[#permalink]  23 Oct 2005, 10:27
vikramm wrote:
Yes OA is B.

DOH!! I made a real silly mistake on this one....

jesus vikramm, I really expect more challenging material from you! PP

why does your nickname in your sig only contain one m?
Senior Manager
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[#permalink]  23 Oct 2005, 10:30
Vikram was taken... so I added the other m... so there is a "clear" distinction between him (-m) and me
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[#permalink]  23 Oct 2005, 11:01
I go with B too...

GSR: remember to get some good night sleep
gsr wrote:
gsr wrote:
is it 1) 0 to 3
used some crude reasoning! Don't want to be with an incorrect explanation for a wrong pick!

I am sorry. I meant B.
I thought of it as a circle with radius = 10
X^2 + Y^2 = 10^2 where X = x^2
So x^2 = 10 for max value of x.(from 0,0) => x>3 & <4
Director
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Posts: 589
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[#permalink]  23 Oct 2005, 11:28
fresinha12 wrote:
I go with B too...

GSR: remember to get some good night sleep
gsr wrote:
gsr wrote:
is it 1) 0 to 3
used some crude reasoning! Don't want to be with an incorrect explanation for a wrong pick!

I am sorry. I meant B.
I thought of it as a circle with radius = 10
X^2 + Y^2 = 10^2 where X = x^2
So x^2 = 10 for max value of x.(from 0,0) => x>3 & <4

GSR - I was chatting with you until 2:30am my time last night! did you sleep at all? You better not be taking that "study drug"!
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"Wow! Brazil is big." â€”George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

http://www.nytimes.com/2005/11/21/inter ... prexy.html

Director
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[#permalink]  23 Oct 2005, 15:06
Titleist wrote:
GSR - I was chatting with you until 2:30am my time last night! did you sleep at all? You better not be taking that "study drug"!

Yes, I went to sleep soon after that time. "study drug" is not as effective as it is suppoesd to be. It makes me sleepy by 12 in the night and wakes me up only by 7:30 in the morning! I wouldn't recommend that anyway.
Director
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[#permalink]  23 Oct 2005, 15:09
gsr wrote:
Titleist wrote:
GSR - I was chatting with you until 2:30am my time last night! did you sleep at all? You better not be taking that "study drug"!

Yes, I went to sleep soon after that time. "study drug" is not as effective as it is suppoesd to be. It makes me sleepy by 12 in the night and wakes me up only by 7:30 in the morning! I wouldn't recommend that anyway.

Interesting...

I heard adderall was pretty good. I heard good results from people who used it during exams. Still quite skeptical though. Surely, nothing beats a good night's sleep.
_________________

"Wow! Brazil is big." â€”George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

http://www.nytimes.com/2005/11/21/inter ... prexy.html

Director
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[#permalink]  23 Oct 2005, 15:25
Titleist wrote:
I heard adderall was pretty good. I heard good results from people who used it during exams. Still quite skeptical though. Surely, nothing beats a good night's sleep.

So it is 'adderall'. Ok let me try it today
Director
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[#permalink]  23 Oct 2005, 16:22
fresinha12 wrote:
where can i get some?

gsr wrote:
Titleist wrote:
I heard adderall was pretty good. I heard good results from people who used it during exams. Still quite skeptical though. Surely, nothing beats a good night's sleep.

So it is 'adderall'. Ok let me try it today

My goodness guys, so eager to pop a pill!

You need a prescription from your doctor. You have to convince him that you have adult ADD. It's nothing but an amphetamine. Don't take it unless you really need it. This is just from what I heard.

_________________

"Wow! Brazil is big." â€”George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

http://www.nytimes.com/2005/11/21/inter ... prexy.html

Director
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[#permalink]  23 Oct 2005, 16:31
No worries! Everyone is fine. Nobody needs a pill!
Director
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[#permalink]  23 Oct 2005, 16:32
gsr wrote:
No worries! Everyone is fine. Nobody needs a pill!

But these are "mind enhancing" pills. YOU NEED IT!

j/k

_________________

"Wow! Brazil is big." â€”George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

http://www.nytimes.com/2005/11/21/inter ... prexy.html

Director
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[#permalink]  23 Oct 2005, 16:37
Titleist wrote:
gsr wrote:
No worries! Everyone is fine. Nobody needs a pill!

But these are "mind enhancing" pills. YOU NEED IT!
j/k

Why?! You think my mind is not enhanced-enough!?
Current Student
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[#permalink]  23 Oct 2005, 16:41
I just need something to put me to sleep for a good solid 8+hrs...

gsr wrote:
Titleist wrote:
gsr wrote:
No worries! Everyone is fine. Nobody needs a pill!

But these are "mind enhancing" pills. YOU NEED IT!
j/k

Why?! You think my mind is not enhanced-enough!?
Director
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[#permalink]  23 Oct 2005, 16:46
fresinha12 wrote:
I just need something to put me to sleep for a good solid 8+hrs...

Log-off and go to bed! This might work
[#permalink] 23 Oct 2005, 16:46

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