Logarithms Q22

22.	If logx 9 = - 1 , then x is equal to: 16 2
	A. - 3 4 B. 3 4 C. 81 256 D. 256 81

Answer: Option D

Explanation:

logx		9		= -	1
		16			2

x-1/2	=	9
		16

	1	=	9
	x		16

x =	16
	9

x =	(	16	)	2
		9

x =	256
	81