Solve the equation log 3(x-8)=2.

Topic:

Math

Asked on

3 Answers | Add Yours

Top Answer

giorgiana1976's profile pic

Posted on

Before solving the equation, which is a logarithmical equation, we have to find out the restrictive domain for the x values.

For this reason, we have to impose the condition that x-8>0.

x>8, that means that x belongs to the interval (8, +inf).

Now, we can solve the equation:

x-8=3^2

x-8=9

x=9+8

x=17

The solution is acceptable because is belonging to the interval of allowed x values.

tonys538's profile pic

Posted on

The equation `log_3(x-8)=2` has to be solved for x.

If the logarithm of a number y to base b is x, `log_b y = x` , then y is equal to b^x.

Using this relation, for `log_3(x - 8) = 2` , the base of the logarithm is 3

This gives x - 8 = 3^2

x - 8 = 9

x = 9+8

x = 17

The solution of the equation is x = 17

isbeatbox's profile pic

Posted on

3x-24=2

3x=26

x=8.66....   or x=8+2/3

3((8+2/3)-8)=2

26-24=2

2=2

We’ve answered 302,422 questions. We can answer yours, too.

Ask a question