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Mathematics

Solve the following equation for x:

log2(x2 - 1) = 3

Logarithms

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Answer

Given,

log2(x21)\text{log}_2(x^2 - 1) = 3

⇒ x2 - 1 = 23

⇒ x2 - 1 = 8

⇒ x2 = 9

⇒ x = 9=±3\sqrt{9} = \pm3.

Hence, x = ±3.

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