Sirakri wrote:
Bunuel
Can we say that, for a negative number, ODD ROOT is defined but EVEN ROOT isn't.
5THROOT(-1)=-1
SQRT(-Y^2)=NOT DEFINED.
Thank you.
Posted from my mobile device
Yes.
When the GMAT provides the square root sign for an even root, such as\(\sqrt{x}\) or\(\sqrt[4]{x}\) , then the only accepted answer is the positive root. That is,\(\sqrt{16}=4\) , NOT +4 or -4.Even roots have only a positive value on the GMAT.
\(\sqrt{negative}=undefined\)
In contrast, the equation\(x^2=16\) has TWO solutions, +4 and -4.
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