Question

If 3^x =81 then find the values of 3^x-4 and 9^x-4

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

${3}^{x} = 81 \\ we \: know \: that \: {9}^{2} = 81 \: and \: {3}^{2} = 9 \\ so \: ( {3 {}^{2} })^{2} = 81 \\ x = 4 \\ {3}^{4} - 4 \\ 81 - 4 = 77 \\ {9}^{4} - 4 \\ 6561 - 4 = 6557$

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