5-7

Last week we learned section 5-7. In 5-7 it was dealing with log and solves it by a variable as an exponent.

To solve for a variable as a exponent you take the log of both sides, bring the exponents to the front and solve.
- to change a base given log( base is b)^a

Log( base x)^a/log( base x)^b is where x is the base you want

Examples:


Change log (base 5)^8 to base 2

Log(base 2)8/ log (base 2) 5


Solve 3^x=81
Log 3^x=log 81

X log 3= log 81
X=log 81/log 3 = 4


If you know all your steps and the procedure of doing this you will not get stuck on this and it will be really easy for you.