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Column A r ≠ 1 Column B   2r   r2 + 1

Column A Column B
2r r2 + 1

(A) Column A is larger
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set U: Algebraic Expressions

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Posted: 10/31/2012 01:09
If I substitute -1 vs 1 for r I get different results (2r=+/-2) and (r^2+1=2) so shouldn't the answer be D? Thanks
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Posted: 10/31/2012 02:54
r= -10 >> -20 < 101
r = 0 >> 0 < 1
r=2 >> 4 < 5
r = 100 >> 200 < 10001

Mona, it seems like A < B, except when r=1, but that is not allowed by the problem. So B is the answer.
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