ACT Math : How to add complex numbers

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #1 : Complex Numbers

Suppose  and

Evaluate the following expression:

Possible Answers:

Correct answer:

Explanation:

Substituting for  and , we have

 This simplifies to

which equals 

Example Question #1 : How To Add Complex Numbers

What is the solution of the following equation?

Possible Answers:

Correct answer:

Explanation:

A complex number is a combination of a real and imaginary number. To add complex numbers, add each element separately.

First, distribute:

Then, group the real and imaginary components:

Solve to get:

Example Question #142 : Exponents

What is the sum of  and  given

and

?

Possible Answers:

Correct answer:

Explanation:

A complex number is a combination of a real and imaginary number. To add complex numbers, add each element separately.

In equation  is the real component and  is the imaginary component (designated by ).

In equation  is the real component and  is the imaginary component.

When added, 

Example Question #143 : Exponents

Complex numbers take the form , where a is the real term in the complex number and bi is the nonreal (imaginary) term in the complex number.

Simplify: 

Possible Answers:

Correct answer:

Explanation:

When adding or subtracting complex numbers, the real terms are additive/subtractive, and so are the nonreal terms.

Example Question #2 : How To Add Complex Numbers

Complex numbers take the form , where a is the real term in the complex number and bi is the nonreal (imaginary) term in the complex number.

Can you add the following two numbers: ? If so, what is their sum?

 

Possible Answers:

Correct answer:

Explanation:

Complex numbers take the form a + bi, where a is the real term in the complex number and bi is the nonreal (imaginary) term in the complex number. Taking this, we can see that for the real number 8, we can rewrite the number as , where  represents the (zero-sum) non-real portion of the complex number.

Thus, any real number can be added to any complex number simply by considering the nonreal portion of the number to be .

Example Question #11 : Complex Numbers

Complex numbers take the form , where  is the real term in the complex number and  is the nonreal (imaginary) term in the complex number.

Which of the following is incorrect?

Possible Answers:

Correct answer:

Explanation:

Complex numbers take the form , where  is the real term in the complex number and  is the nonreal (imaginary) term in the complex number.

Thus, to balance the equation, add like terms on the left side.

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