1.

If `(9)^(2x+4)=(243)^(2x-3.2)` , then x =_______A. 12B. 10C. 8D. 4

Answer» Correct Answer - D
Given ,
`(9)^(2x+4)=(243)^(2x-3.2)`
`rArr (3)^(4x+8)=(3)^(10x-16)`
`rArr 4x+8=10x-16`
`rArr 6x=24rArr x=4`
Hence the correct option is (d).


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