All Algebra II Resources
Example Questions
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:
Example Question #74 : Solving Logarithms
Solve /
The first thing we can do is move both log functions to one side of the equation:
Then we can combine the log functions (remember, when you add logs, we multiply the terms inside):
Now we can rewrite the equation in exponent form (and FOIL the multiplied terms):
We can collect all the terms on one side of the equation, and then solve the quadratic:
However, if we plug into the initial equation, we would be taking the log of a negative number, which we can't do, so it's not a valid solution:
Example Question #75 : Solving Logarithms
Solve .
We first put both logs on one side of the equation:
Now we combine the log terms (remember, when we subtract logs we divide the terms inside):
We can now rewrite the equation in exponential form:
Anything raised to the power is , and now we can solve algebraically: