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25 Nov 2010, 01:49
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
79% (00:32) correct
21%
(00:46)
wrong
based on 173
sessions
History
Date
Time
Result
Not Attempted Yet
If 25(5^x) = 1 then x=
A. –2
B. –1
C. 0
D. 1
E. 2
A. –2
B. –1
C. 0
D. 1
E. 2
I have probelm with this question .
I solved it like 5^2(5^x)=1
2+x=1
X=-1
But my answer is wrong or the answer from the source is wrong please help ....
I solved it like 5^2(5^x)=1
2+x=1
X=-1
But my answer is wrong or the answer from the source is wrong please help ....
25 Nov 2010, 01:53
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rite2deepti
\(25*5^x=1\) --> \(5^2*5^x=1\) --> \(5^{2+x}=1\) --> \(2+x=0\) (\(a^0=1\) - any nonzero number to the power of 0 is 1) --> \(x=-2\).
Answer: A.
31 Dec 2017, 01:16
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rite2deepti
\(5^2\)\(5^x\)=1
\(5^x\) = 1/\(5^2\)
\(5^x\) = \(5^-2\)
If bases are same then we can equate powers
Therefore x = -2
