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11 Jun 2019, 17:45
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Hi guys, during a practice question i ran into the following :
10\sqrt{-4} / 10\sqrt{-7}
Would partly cancel to yield 1 / 10\sqrt{-3}
I cant quite wrap my head around this, is it possible in a calc like this to just turn it around and put a 1 on top of it ? Hope someone can help me out, thanks a lot
Posted from my mobile device
10\sqrt{-4} / 10\sqrt{-7}
Would partly cancel to yield 1 / 10\sqrt{-3}
I cant quite wrap my head around this, is it possible in a calc like this to just turn it around and put a 1 on top of it ? Hope someone can help me out, thanks a lot
Posted from my mobile device
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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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11 Jun 2019, 22:54
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Moaktree
What you have written is \(10\sqrt{-4} / 10\sqrt{-7}\), which is wrong as per GMAT, there are no negative roots.
I believe what you meant was \(\frac{10^{-4}}{10^{-7}}\)..
Here you can take the powers up and down by changing the signs..
\(\frac{10^{-4}}{10^{-7}}\)=\(\frac{1}{10^{4}*10^{-7}}=\frac{1}{10^{4-7}}\), basically you are multiplying both numerator denominator by \(10^4\)
\(\frac{10^{-4}}{10^{-7}}\)=\(10^{-4}*10^{7}=10^{7-4}=10^3\), basically you are multiplying both numerator denominator by \(10^7\)
12 Jun 2019, 09:58
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Hi Moaktree,
For the theory, check # 8. Exponents and Roots of Numbers
Hope this helps
For the theory, check # 8. Exponents and Roots of Numbers
Hope this helps
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
