X+2ind x. – InterviewSolution

1.

X+2ind x.

Answer»

9^(x+2) -9^x = 240

=> 9^x(9²-1) = 240=> 9^x(80) = 240=> 9^x = 240/80 = 3=> 3^2x = 3=> 2x = 1=> x = 1/2

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