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18 Oct 2018, 01:37
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
75% (01:18) correct
25%
(01:24)
wrong
based on 350
sessions
History
Date
Time
Result
Not Attempted Yet
If x and y are both positive then \(\sqrt{72x^3y^{16}} =\)
A. \(8xy^8\sqrt{2x}\)
B. \(6xy^4\sqrt{2x}\)
C. \(6xy^8\sqrt{2x}\)
D. \(6y^4\sqrt{8x}\)
E. \(9xy^8\sqrt{8x}\)
A. \(8xy^8\sqrt{2x}\)
B. \(6xy^4\sqrt{2x}\)
C. \(6xy^8\sqrt{2x}\)
D. \(6y^4\sqrt{8x}\)
E. \(9xy^8\sqrt{8x}\)
18 Oct 2018, 09:38
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Bunuel
hi Bunuel I think the \(y^1\)should be y^16 there seems to be a typo
\(72 = 2^3 * 3^2\)
Once rearranged it can be \(2^2 * 2^1 * 3^2 * x^2 * x^1 * y^16\)
Taking the square root of that we get \(2*3*x*y^8 * \sqrt{2x}\) = \(6xy^8 *\sqrt{2x}\)
answer choice C
05 Nov 2018, 11:14
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Bunuel
Dear Moderator,
There seems to be a small typo in the above question, for Y to be taken out of the square root as available in the answer choices , Y should have been raised to an even power in the question. Hope you will look into this. Thank you.
