Algebra II : Solving Exponential Equations

Study concepts, example questions & explanations for Algebra II

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Example Questions

Example Question #81 : Solving Exponential Equations

Solve for .

Possible Answers:

Correct answer:

Explanation:

When dealing with exponential equations, we want to make sure the bases are the same. This way we can set-up an equation with the exponents. Since the bases are now different, we need to convert so we have the same base. We do know that

 therefore

 With the same base, we can now write

 Add  on both sides.

 Divide  on both sides.

Example Question #82 : Solving Exponential Equations

Solve for .

Possible Answers:

Correct answer:

Explanation:

When dealing with exponential equations, we want to make sure the bases are the same. This way we can set-up an equation with the exponents. Since the bases are now different, we need to convert so we have the same base. We do know that

 therefore

 With the same base, we can now write

 Subtract  on both sides.

 Divide  on both sides.

Example Question #83 : Solving Exponential Equations

Solve for .

Possible Answers:

Correct answer:

Explanation:

When dealing with exponential equations, we want to make sure the bases are the same. This way we can set-up an equation with the exponents. Since the bases are now different, we need to convert so we have the same base. We do know that

 therefore

 Apply power rule of exponents.

 With the same base, we can now write

 Subtract  on both sides.

 Divide  on both sides.

Example Question #84 : Solving Exponential Equations

Solve for .

Possible Answers:

Correct answer:

Explanation:

When dealing with exponential equations, we want to make sure the bases are the same. This way we can set-up an equation with the exponents. Since the bases are now different, we need to convert so we have the same base. We do know that

 therefore

 Apply power rule of exponents.

 With the same base, we can now write

 Subtract  on both sides.

Example Question #85 : Solving Exponential Equations

Solve for .

Possible Answers:

Correct answer:

Explanation:

When dealing with exponential equations, we want to make sure the bases are the same. This way we can set-up an equation with the exponents. Since the bases are now different, we need to convert so we have the same base. We do know that

 therefore

 With the same base and also applying power rule of exponents, we now can write

 Add  on both sides.

 Divide  on both sides.

Example Question #86 : Solving Exponential Equations

Solve for .

Possible Answers:

Correct answer:

Explanation:

When dealing with exponential equations, we want to make sure the bases are the same. This way we can set-up an equation with the exponents. Since the bases are now different, we need to convert so we have the same base. We do know that

 therefore

 With the same base and by also applying the power rule of exponents, we can now write

 Subtract  on both sides.

 

Example Question #87 : Solving Exponential Equations

Solve:  

Possible Answers:

Correct answer:

Explanation:

In order to solve this equation, we will need to change the bases so that both bases are equal.  We can change the bases to base three.

Rewrite the terms in the equation.

The powers can be set equal to each other now that we have similar bases.

Solve for x.

Subtract  on both sides.

Divide by negative 12 on both sides.

The answer is:  

Example Question #88 : Solving Exponential Equations

Evaluate:  

Possible Answers:

Correct answer:

Explanation:

Evaluate by changing the base of the fraction.

Rewrite the equation.

With common bases, we can set the powers equal to each other.

Solve for x.

Subtract x from both sides.

Divide by negative ten on both sides.

The answer is:  

Example Question #89 : Solving Exponential Equations

Solve the equation:  

Possible Answers:

Correct answer:

Explanation:

Convert the right side to a base of 7.

With similar bases, the powers can be set equal to each other.

Multiply both sides by .

Subtract two from both sides.

Factorize the left term to determine the roots of the quadratic.

Set each binomial equal to zero and solve for x.

Ensure that both solutions will satisfy the original equation.  Since there is no zero denominator resulting from substitution, both answers will satisfy.

The answers are:  

Example Question #90 : Solving Exponential Equations

Solve:  

Possible Answers:

Correct answer:

Explanation:

Convert the right fraction to a base of two thirds.

Rewrite the right side.

With similar bases, set both powers equal to each other.

Simplify the right side by distribution.

Subtract  from both sides.

Divide both sides by negative seven.

The answer is:  

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