find the value of x, if 3 ^x-3 ^x-1= 162
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3^(x) - 3^(x-1) = 162
=> 3^(x-1) {3^1 - 1} = 162
=> 3^(x-1) {3 - 1} = 162
=> 3^(x-1) {2} = 162
=> 3^(x-1) = 81
=> 3^(x-1) = 3^4
=> (x-1) = 4
=> x = 5 (ans.)
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