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Target question: Is x POSITIVE?BTGModeratorVI wrote: ↑Thu Jul 23, 2020 6:31 amIs x > 0?
(1) (x + y)^2 < (x - y)^2
(2) x + y < x - y
Answer: C
Source: Magoosh
In the question, first statement isBrent@GMATPrepNow wrote: ↑Sun Jul 26, 2020 6:24 amTarget question: Is x POSITIVE?BTGModeratorVI wrote: ↑Thu Jul 23, 2020 6:31 amIs x > 0?
(1) (x + y)^2 < (x - y)^2
(2) x + y < x - y
Answer: C
Source: Magoosh
Statement 1: (x + y )² > (x - y)²
Take: (x + y )² > (x - y)²
Expand and simplify both sides to get: x² + 2xy + y ² > x² - 2xy + y ²
Subtract x² from both sides: 2xy + y ² > -2xy + y ²
Subtract y² from both sides: 2xy > -2xy
Add 2xy both sides: 4xy > 0
Divide both sides by 4 to get: xy > 0
If the product xy> 0, then there are two possibilities:
Case a: x is positive and y is positive. In this case, the answer to the target question is YES, x is positive
Case b: x is negative and y is negative. In this case, the answer to the target question is NO, x is not positive
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT
Statement 2: x + y > x - y
Take: x + y > x - y
Add y to both sides: x + 2y > x
Subtract x from both sides: 2y > 0
Divide both sides by 2 to get: y > 0
So, we know that y is positive, but we have no information about x
So, we cannot answer the target question with certainty.
Statement 2 is NOT SUFFICIENT
Statements 1 and 2 combined
Statement 1 tells us that there are two possible cases (case a: x and y are both positive OR case b: x and y are both negative)
Statement 2 tells us that y is positive
So, statement 2 ELIMINATES case b, which means x and y are both positive
The answer to the target question is YES, x is positive
Since we can answer the target question with certainty, the combined statements are SUFFICIENT
Answer: C
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