Logarithmic function:solve for x: 4 log x2, Mathematics

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Solve for x: 4 log x = log (15 x² + 16)

Solution: x⁴ - 15 x² - 16 = 0

(x² + 1)(x² - 16) = 0

x = ± 4

But log x is not described when x = - 4, the x = 4 is the only answer.

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