Algebra II : Basic Operations with Complex Numbers

Study concepts, example questions & explanations for Algebra II

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Example Questions

Example Question #51 : Basic Operations With Complex Numbers

Possible Answers:

Correct answer:

Explanation:

Example Question #52 : Basic Operations With Complex Numbers

Possible Answers:

Correct answer:

Explanation:

 

Example Question #53 : Basic Operations With Complex Numbers

Evaluate:  

Possible Answers:

Correct answer:

Explanation:

The value of .  We can rewrite the expression as the product of exponents to simplify.

Identify the values of  and .

Replace the values and simplify.

The answer is:  

Example Question #54 : Basic Operations With Complex Numbers

Solve:  

Possible Answers:

Correct answer:

Explanation:

Evaluate the inner terms of the imaginary values.

The value of .

The expression becomes:  

The answer is:  

Example Question #55 : Basic Operations With Complex Numbers

Express the following number in the form , where  and  are real numbers:

Possible Answers:

Correct answer:

Explanation:

Since there is a complex number in the form  in the denominator of the given expression, multiply the numerator and the denominator of the expression by its complex conjugate:

This number is now expressed in the form , where  and . Hence, the correct answer is .

Example Question #56 : Basic Operations With Complex Numbers

Evaluate:  

Possible Answers:

Correct answer:

Explanation:

Recall that .

Rewrite the power of 243 as a product of a power of three.

Simplify the expression. 

The answer is:  

Example Question #57 : Basic Operations With Complex Numbers

Determine the value of:  

Possible Answers:

Correct answer:

Explanation:

In order to determine the exact value of , we will need to rewrite this exponent as a product of exponents.

Recall that .

Therefore, 

The answer is:  

Example Question #58 : Basic Operations With Complex Numbers

Add:  

Possible Answers:

Correct answer:

Explanation:

The expression contain imaginary terms.  The values can be simplified.

Recall that:

This indicates that:

Rewrite the expression.  For powers higher than the given terms, we can rewrite that power as a product of exponents.

The answer is:  

Example Question #59 : Basic Operations With Complex Numbers

Evaluate:  

Possible Answers:

Correct answer:

Explanation:

Write the first few terms of the imaginary powers.

The term with  can be rewritten as a product of exponents.

Re-substitute the values.

The answer is:  

Example Question #121 : Imaginary Numbers

Evaluate:  

Possible Answers:

Correct answer:

Explanation:

Do not use the FOIL method to simplify these terms.  Instead, write out the first few terms of  referring to the problem, as well as the value of .

Substitute all the values of the imaginary numbers to the expression.

Simplify the terms.

The answer is:  

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