8/7^2*7^x-2*7^x-2 = 42 Please answer it fast along with explanation – InterviewSolution

1.

8/7^27^x-27^x-2 = 42 Please answer it fast along with explanation

Answer»

Step-by-step explanation:

(8/7)^2 ×(7)^x-2×(7)^x-2=42

64/49 ×(7)^x+x -4 = 42

64-196/49 ×7^2x = 42

-132/49 ×7^2x = 42

7^2x = 42 - 132/49

7^2x = 2058 -132/49

7^2x = 1926/49

.......

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