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GRE Math Challenge #39-integer x, its square is how much
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19 Sep 2014, 03:24
19 Sep 2014, 03:24
Expert Reply
00:00
Question Stats:
67% (00:44) correct
32% (00:19) wrong based on 28 sessions
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For any positive integer x, its square is how much greater than the square of the preceding integer , x-1?
A. \(x^2-1\)
B. \(x+1\)
C. \(x-1\)
D. \(2x+1\)
E. \(2x-1\)
A. \(x^2-1\)
B. \(x+1\)
C. \(x-1\)
D. \(2x+1\)
E. \(2x-1\)
Re: GRE Math Challenge #39-integer x, its square is how much
[#permalink]
10 Apr 2020, 13:55
10 Apr 2020, 13:55
Expert Reply
\(n^2-(n-1)^2\)
\(n^2-n^2+1-2n\)
\(2n-1\)
E is the answer
\(n^2-n^2+1-2n\)
\(2n-1\)
E is the answer
gmatclubot
Re: GRE Math Challenge #39-integer x, its square is how much [#permalink]
10 Apr 2020, 13:55
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