Question

3 - log x= log3x +log 16

Answer 1

D:  x > 0

 

3 - log x= log3x +log 16

log 10^3 - log x = log (3x * 16)

log [ 10^3 / x ] = log (48x)

1000 / x = 48x

48x * x = 1000

48x^2 = 1000

x^2 = 1000/48

x^2 = 250/12

x^2 = 125/6

x = √(125/6)

x = 5√5 / √6

x = 5√30 / 6    ------------  odpowiedź