All Algebra II Resources
Example Questions
Example Question #207 : Logarithms
Solve .
The first thing we can do is get rid of the exponent in the second log, and then divide both sides by that coefficient:
It can be a pain to work with logs of different bases, so let's change the base log to base :
We can now take the denominator, expand, and simplify:
Now, we combine the log terms:
Taking the square root of each side:
We have to solve for both the plus, and the minus. Let's start with the negative:
And now the positive:
Plugging both of these answers into the original equation produces no errors, so both answers are valid.
Example Question #208 : Logarithms
Solve .
First, we can use the log product rule to combine the log terms:
Now we write the equation in exponential form:
If we plug into the original equation, we get errors (we can't take the log of a negative value). is fine though, and is our only solution.
Example Question #61 : Solving And Graphing Logarithms
Solve .
We can combine the logs on the right side of the equation while also using the product rule on the log on the left side:
Since the logs have the same base, we can equate the algebraic equations equal to each other:
Now we can solve the quadratic equation:
Plugging this into the original equation doesn't produce errors, so it's our single solution.
Example Question #210 : Logarithms
Solve .
First we take the natural log of both sides of the equation:
Remember, taking the natural log of with an exponent equals that exponent, and the natural log of is :
Form here, we solve algebraically:
Example Question #211 : Logarithms
Solve .
First we start by subtracting from each side:
Next, we rewrite the equation in exponent form:
Finally, we divide by :
Example Question #212 : Logarithms
Solve .
First, we subtract from each side:
Next, we divide each side by :
Now we rewrite the equation in exponent form:
And we finish using algebra:
Example Question #213 : Logarithms
Solve
First, we add to each side:
Next, we take the exponent in the log and make it a coefficient:
And divide by the new coefficient:
Now we write the equation in exponent form:
Example Question #71 : Solving And Graphing Logarithms
Solve .
The first thing we can do is combine all the log terms on the right side of the equation:
Next, we can take the coefficient from the left term and make it an exponent:
Now we can cancel the logs from both sides:
When we put back into the original question, we don't have problems. When we try it with however, we get errors, so that's not a valid answer:
Example Question #72 : Solving Logarithms
Solve .
First, we take the coefficient, , and make it an exponent:
Now we can cancel the logs:
When we check our answers, however, we notice that results in errors, so that's not a valid answer:
Example Question #211 : Logarithms
Solve ,
First, we combine the log terms on the left of the equation:
Now we can cancel the logs on each side:
We can subtract from each side to set the equation equal to . this will give us a nice quadratic equation to solve:
Notice that is not a valid answer, because if we plug it into the original equation then we would be taking the log of a negative number, which we can't do. Our only solution is:
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