converting from symbolic to numerical

inside a loop when i differentiate and substitude the values to my function i get something like this 2*log(12512)/log(144) +1 but i want the exact value of it. what should i do in order to get a exact number (log 10 base)

thank you

Answer 1

[KSSV]

Read about double, vpasolve.

[ilan ancelseritcioglu]

got it thank you

[KSSV]

Thanks is accepting/ voting the answer. :)