`log_(2) 5 + log_(4) 18 =`
`= log_(2) 5 + log_(4) (2 cdot 9) =`
`= log_(2) 5 + log_(4) 2 + log_(4) 9 =`
`= log_(2) 5 + log_(2^2) 2 + log_(2^2) 3^2 =`
`= log_(2) 5 + 1/2log_(2) 2 + 1/2log_(2) 3^2 =`
`= log_(2) 5 + 1/2log_(2) 2 + 1/2 cdot 2 cdot log_(2) 3 =`
`= log_(2) 5 + 1/2+ log_(2) 3 =`
`= log_(2) (5 cdot 3) + 1/2 =`
`= log_(2) 15 + 1/2`