The equation has the solution:

MATHEMATICS · Single correct · A Level · Mathematics · Exponentials and logarithms · Exponentials and logarithms

Problem

The equation (log⁡x)2−4log⁡x−5=0(\log x)^2 - 4\log x - 5 = 0 has the solution: (A) x=110x = \frac{1}{10} (B) x=110,100000x = \frac{1}{10}, 100000 (C) x=1000x = 1000 (D) No Solution

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