Question

find the value of x

plz answer fast I'll mark you brainlisest
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Answer 1

Answer:

1/9

for explanation see the image attached

Answer 2

Answer:

Mark as brainliest.

Step-by-step explanation:

$\frac{10}{3} \times {3}^{x} - {3}^{x - 1} = 81 \\ = > 10 \times {3}^{x} \times {3}^{ - 1} - {3}^{x - 1} = 81 \\ = > 10 \times {3}^{x - 1} - {3}^{x - 1} = 81 \\ = > {3}^{x - 1} (10 - 1) = 81 \\ = > {3}^{x - 1} \times 9 = 81 \\ = > {3}^{x - 1} = \frac{81}{9} \\ = > {3}^{x - 1} = 9 \\ = > {3}^{x - 1} = {3}^{2} \\ = > x - 1 = 2 \\ = > x = 2 + 1 \\ = > x = 3$

Value of

{x}^{-2} = {3}^{-2}

{x}^{-2} = 1/9