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LulaBrazilia
- Master | Next Rank: 500 Posts
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The answer is B. I go through the question in detail in the full solution below (taken from the GMATFix App).
-Patrick
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what is the value of x^2 - y^2?
Source: Beat The GMAT — Data Sufficiency |
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Patrick_GMATFix
- GMAT Instructor
- Posts: 1052
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Recognize the quadratic tested: x^2 - y^2 = (x-y)(x+y). Rephrase: what is (x-y)(x+y)?. Statement (1) is not sufficient (just plug in different values for x,y and test) but (2) is sufficient since multiplying both sides by (x+y) gives us the value we need.
The answer is B. I go through the question in detail in the full solution below (taken from the GMATFix App).
-Patrick
The answer is B. I go through the question in detail in the full solution below (taken from the GMATFix App).
-Patrick
- Check out my site: GMATFix.com
- To prep my students I use this tool >> (screenshots, video)
- Ask me about tutoring.
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theCodeToGMAT
- Legendary Member
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- GMAT Score:650
To find: x^2 - y^2 or (x+y)(x-y)
Statement 1:
x - y = y + 2
INSUFFICIENT
Statement 2:
(x-y) = 1/(x+y)
(x-y)(x+y) = 1
SUFFICIENT
[spoiler]{B}[/spoiler]
Statement 1:
x - y = y + 2
INSUFFICIENT
Statement 2:
(x-y) = 1/(x+y)
(x-y)(x+y) = 1
SUFFICIENT
[spoiler]{B}[/spoiler]
R A H U L
