using the log law ln(a) + ln(b) = ln(a*b),
lOG(x)+ log(2x) = log(2x^2)
log(2x^2) = 5
Take the inverse log of both sides
2x^2 = 10^5 (assuming its log base 10)
therefore x^2 = (10^5)/2
so x = sqrt((10^5)/2) = sqrt 50,000 = 100 * sqrt(5) = 223.61 (5sf)