Question

If 3^x−1 = 3^2x × 81, find the value of x

Answer 1

81 = 3⁴

so ,

3^(x-1) = 3^(2x) × 3⁴ = 3^(2x + 4)

• 3 gets cancelled

x - 1 = 2x + 4

2x - x = -1-4 = -5

x = -5

Answer 2

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