Exponential and Logarithmic Functions

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Pre-Calculus › Exponential and Logarithmic Functions

Questions 1 - 10
1

Solve:

None of the other answers.

Explanation

Combine the constants:

Isolate the exponential function by dividing:

Take the natural log of both sides:

Finally isolate x:

2

Solve for .

Explanation

First, let's begin by simplifying the left hand side.

becomes and becomes . Remember that , and the in that expression can come out to the front, as in .

Now, our expression is

From this, we can cancel out the 2's and an x from both sides.

Thus our answer becomes:

.

3

Solve for .

Explanation

First, let's begin by simplifying the left hand side.

becomes and becomes . Remember that , and the in that expression can come out to the front, as in .

Now, our expression is

From this, we can cancel out the 2's and an x from both sides.

Thus our answer becomes:

.

4

Solve:

None of the other answers.

Explanation

Combine the constants:

Isolate the exponential function by dividing:

Take the natural log of both sides:

Finally isolate x:

5

Solve for .

Explanation

First, let's begin by simplifying the left hand side.

becomes and becomes . Remember that , and the in that expression can come out to the front, as in .

Now, our expression is

From this, we can cancel out the 2's and an x from both sides.

Thus our answer becomes:

.

6

Solve:

None of the other answers.

Explanation

Combine the constants:

Isolate the exponential function by dividing:

Take the natural log of both sides:

Finally isolate x:

7

Solve the equation for .

Explanation

The key to this is that . From here, the equation can be factored as if it were .

and

and

and

Now take the natural log (ln) of the two equations.

and

and

8

Solve the equation for .

Explanation

The key to this is that . From here, the equation can be factored as if it were .

and

and

and

Now take the natural log (ln) of the two equations.

and

and

9

Solve the equation for .

Explanation

The key to this is that . From here, the equation can be factored as if it were .

and

and

and

Now take the natural log (ln) of the two equations.

and

and

10

Completely expand this logarithm:

The answer is not present.

Explanation

We expand logarithms using the same rules that we use to condense them.

Here we will use the quotient property

and the power property

.

Use the quotient property:

Rewrite the radical:

Now use the power property:

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