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expected answer

Expert replies
by sanju09 » Wed Apr 22, 2009 2:59 am
Frazer was supposed to take the cube root of x and then square of that. Instead of that he took the square of x first and then took the cube root. The answer obtained is
A. smaller than expected answer.
B. larger than expected answer.
C. same as expected answer.
D. opposite in sign to the expected answer.
E. in variance with x.



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Source: — Problem Solving |

by Sher1 » Wed Apr 22, 2009 3:12 am
Should be C. xsqrt3^2 or x2sqrt3

(x)2/3 or (x)2/3 either way
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by shibal » Thu Apr 23, 2009 10:16 am
C

seems hard, but just plug in a number. i.e. 8
8^1/3 = 2; 2^2 = 4
8^2 = 64; 64^1/3= 4

they are the same... :P
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by dwilliams05 » Thu Apr 23, 2009 10:48 am
I agree. should be C

(x^1/2)^1/3 = (x^1/3)^1/2. Both are x^1/6
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