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Is |a^2-b^2|<10?

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by Max@Math Revolution » Mon Jul 18, 2016 8:17 am
Is |a^2-b^2|<10?
1) |a-b|<5
2) |a+b|<2

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Source: — Data Sufficiency |
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by Max@Math Revolution » Mon Jul 18, 2016 8:17 am
Since there are 2 variables in the original condition, the correct answer is C.

- Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
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