Multiplying Complex Numbers

Discussion in 'Other Pre-University Math' started by nycmathguy, Sep 14, 2021.

  1. nycmathguy

    nycmathguy

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    Section 2.4
    32 & 34

    Question 32

    (7 - 2i)(3 - 5i)

    21 - 35i - 6i + 10i^2

    21 - 41i + 10(-1)

    21 - 41i - 10

    11 - 41i

    Question 34

    -8i(9 + 4i)

    -72i - 32i^2

    -72i - 32(-1)

    -72i + 32

    Switch the terms.

    32 - 72i

    You say?

    20210913_234613.jpg
     
    nycmathguy, Sep 14, 2021
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  2. nycmathguy

    MathLover1

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    perfect
     
    MathLover1, Sep 14, 2021
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  3. nycmathguy

    nycmathguy

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    Good chapter so far. Keep in mind that precalculus is a review for me, a return to MA172.
     
    nycmathguy, Sep 15, 2021
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