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Logarithm - General Aptitude

Q1:

If logx 9 = - 1 , then x is equal to:
16 2

A
- 3
4

B
3
4

C
81
256

D
256
81

ANS:D -

256
81

logx 9 = - 1
16 2
 x-1/2 = 9
16
1 = 9
x 16
 x = 16
9
 x = 16 2
9
 x = 256
81