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Math Expert V
Joined: 02 Sep 2009
Posts: 55266
If x is a non-zero integer, what is the value of xy?  [#permalink]

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11 00:00

Difficulty:   45% (medium)

Question Stats: 70% (02:20) correct 30% (02:27) wrong based on 211 sessions

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Tough and Tricky questions: Algebra.

If x is a non-zero integer, what is the value of xy?

(1) x = 2

(2) $$128^x*6^{(x + y)} = 48^{(2x)}*3^{(-x)}$$

Kudos for a correct solution.

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Manager  Joined: 12 Sep 2014
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Concentration: Strategy, Leadership
GMAT 1: 740 Q49 V41 GPA: 3.94
Re: If x is a non-zero integer, what is the value of xy?  [#permalink]

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2
Statement 1 is clearly insufficient.
Statement 2: You can combine all the bases with the exponent "x". They all end up cancelling out and yielding 6^y=1^x. Here, 1^x is always equal to 1, so 6^y=1 and that should be sufficient.

Answer B
Intern  Joined: 27 Jul 2012
Posts: 25
Re: If x is a non-zero integer, what is the value of xy?  [#permalink]

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1
Statement 1 not sufficient since we clearly dont know value of y
Statement 2 can be simplified to reach 2^y*3^y=1, 6^y=1
This means y=0
This is enough to find xy that is 0

Answer B
Manager  Joined: 22 Sep 2012
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Re: If x is a non-zero integer, what is the value of xy?  [#permalink]

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Statement 1 is clearly insufficient, since we don't know the value of y

Statement 2:
128^x*6^(x + y) = 48^(2x)*3^(-x)

This can be simplified as

2^8x * 2^y * 3^x*3^y = 2^8x*3^x
=> 2^y *3^y=1
Only possible if y = 0

Therefore xy = 0. Sufficient

Hence B) is the answer
Manager  Joined: 31 Jul 2014
Posts: 127
GMAT 1: 630 Q48 V29 Re: If x is a non-zero integer, what is the value of xy?  [#permalink]

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1
Bunuel wrote:

Tough and Tricky questions: Algebra.

If x is a non-zero integer, what is the value of xy?

(1) x = 2
(2) 128^x*6^(x + y) = 48^(2x)*3^(-x)

Kudos for a correct solution.

Statmnt1) Nothing we know about Y...Insuff

Statmnt2)
2^7x * 2^(x+y) * 3^(x+y) = 3^2x*2^8x*3^(-x)
2^8x+y * 3^(x+y) = 3^x * 2^8x

so y=0 -> xy=0

Suff, IMO B
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Re: If x is a non-zero integer, what is the value of xy?  [#permalink]

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There is another thread on this post which is actually locked. In that question says to find the value of x^y and here it says to find xy though it doesn't matter which one you find as answer will be same. I just want to clarify which question is correct.

Below is the link of that locked thread.

if-x-is-a-non-zero-integer-what-is-the-value-of-x-y-1-x-30817.html
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Anaira Mitch
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Re: If x is a non-zero integer, what is the value of xy?  [#permalink]

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anairamitch1804 wrote:
There is another thread on this post which is actually locked. In that question says to find the value of x^y and here it says to find xy though it doesn't matter which one you find as answer will be same. I just want to clarify which question is correct.

Below is the link of that locked thread.

if-x-is-a-non-zero-integer-what-is-the-value-of-x-y-1-x-30817.html

Hi,

Both the questions are correct.

If you solve the equation in statement 2. You get y=0
This is sufficient to get the value of xy and x^y, as we are already given that x is a non zero integer in both the questions.
Given y=0, xy = 0 and x^y = 1.
SVP  V
Joined: 26 Mar 2013
Posts: 2176
Re: If x is a non-zero integer, what is the value of xy?  [#permalink]

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If x is a non-zero integer, what is the value of xy?

x could negative or positive integer. y could be any number

(1) x = 2

No info about y.

Insufficient

(2) 128^x*6^(x + y) = 48^(2x)*3^(-x)

Simplifying the equation above keeping an eye of 3 as it has x & y......... 3^(x+y) = 3^x

x+y=x............then y=0

xy=0

Sufficient

Answer: B
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Re: If x is a non-zero integer, what is the value of xy?  [#permalink]

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_________________ Re: If x is a non-zero integer, what is the value of xy?   [#permalink] 29 Nov 2018, 17:19
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