Hey all!
I’m super confused when to consider a positive root on GRE vs. when to consider both negative and positive roots.
Some books mention that when ETS explicitly gives a (root) symbol, we only take positive root. If, however, you encounter square root whilst you solve a problem, you consider both.
But in a couple of Gregmat questions, I had to only consider positive root for the latter condition as well.
Can someone clarify this for me with an example. Much appreciated!
hey man as far as i know and gre even clarify in his video
IF we have to conside the root result as negative they will give it
like
-√49
thats will be -7
in other case like
√25 = 5, √36=6
here no negative value
to make neagtive they put negative(-ve) sign before the root
Hi, always take both the roots because ideally both the roots satisfy the values…
If suppose its mentioned a>0 and a^2=36…then obviously you cannot take a as -6 (the -ve root).
However for convention (doesn’t work in the GRE though) we take the positive root. In case of quadratics always take both the roots.
Hope this helps.