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March 31, 2015

March 31, 2015

Posted by **Deb** on Wednesday, April 24, 2013 at 3:49pm.

Log x +log2x = 4

Wouldn't this be no solution because log x is undefined?

- college algebra -
**Reiny**, Wednesday, April 24, 2013 at 6:09pmlogx + log 2x = 4

log (x(2x)) = 4 , using the rule log AB = logA + logB

log (2x^2) = 4

so 2x^2 = 10^4

2x^2 = 10000

x^2= 5000

x = ± √ 5000

but x > 0 for log x to be defined

so x = √5000

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