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27 Aug 2013, 18:17
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An extract from GMAT club tests:
Must know for the GMAT: if x is a positive integer then root(x) is either a positive integer or an irrational number. (It cannot be some reduced fraction e.g. 73 or 12).
can't root(x) be negative?
Must know for the GMAT: if x is a positive integer then root(x) is either a positive integer or an irrational number. (It cannot be some reduced fraction e.g. 73 or 12).
can't root(x) be negative?
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27 Aug 2013, 18:26
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another instance : First of all notice that since x is a positive number then root(x)>0.
27 Aug 2013, 21:34
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nksbits
By definition (as far as GMAT is concerned), \(\sqrt{x}\) is positive only.
\(\sqrt{4} = 2\)
It is not +2 or -2.
In case you have \(x^2 = 4\), x can take two values, 2 or -2.
