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Thread: Precal:Complex numbers

  1. #1
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    Precal:Complex numbers

    What is true about the complex number -5-5i? check all that apply

    a. the modulus is 5√2.

    b. it lies in quadrant 3.

    c. it lies in quadrant 2.

    d. the modulus is 5


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  2. #2
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    Re: Precal:Complex numbers

    Quote Originally Posted by xanxan0710 View Post
    What is true about the complex number -5-5i? check all that apply

    a. the modulus is 5√2.

    b. it lies in quadrant 3.

    c. it lies in quadrant 2.

    d. the modulus is 5

    Hint: $|-5-5{\bf{i}}|=\sqrt{(5)^2+(-5)^2}$
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  3. #3
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    Re: Precal:Complex numbers

    Quote Originally Posted by xanxan0710 View Post
    What is true about the complex number -5-5i? check all that apply

    a. the modulus is 5√2.

    b. it lies in quadrant 3.

    c. it lies in quadrant 2.

    d. the modulus is 5

    Have you made no attempt at this yourself? Plato showed how to do (a) and (d). Do you know what "quadrant" means? In particular, what are "quadrant 3" and "quadrant 2"?
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