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exponent.

by 7806 » Fri Nov 19, 2010 12:15 am
Q1:Each of the following equations has at least one solution EXCEPT
A. -2^n = (-2)^-n
B. 2^-n = (-2)^n
C. 2^n = (-2)^-n
D. (-2)^n = -2^n
E. (-2)^-n = -2^-n


pl explain.in brief. thanks.
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by TOPGMAT » Fri Nov 19, 2010 5:50 am
IMO A...
B & C are alike...
D & E.. put n=1...
Therefore A is the culprit... :-)
Whats OA ?
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by 7806 » Fri Nov 19, 2010 11:47 am
thanks...buddy.
oa is A.
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by TOPGMAT » Fri Nov 19, 2010 11:55 am
My method was crude...
I spent lot of time moving the numbers left and right and decide...
I want to know why n=0 is not a solution for choice A...
Can experts help ?

Thanks,
TOPGMAT
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