Power of a Complex Number...4

Discussion in 'Geometry and Trigonometry' started by nycmathguy, Feb 27, 2022.

  1. nycmathguy

    nycmathguy

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    Section 6.6

    Screenshot_20220225-174727_Samsung Notes.jpg

    IMG_20220226_190144.jpg

    IMG_20220226_190154.jpg

    IMG_20220226_190204.jpg
     
    nycmathguy, Feb 27, 2022
    #1
  2. nycmathguy

    MathLover1

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    [​IMG]

    Apply Perfect Cube Formula: \( (a-b )^3=a^3-3a^2b+3ab^2-b^3\) where \(a=sqrt(5)\),\( b=4i\)

    =\((sqrt(5))^3-3(sqrt(5)^2*4i+3sqrt(5)(4i)^2-(4i)^3\).........simplify

    = \(-43sqrt(5)+4*i\)

    = \(-96.151 +4* i\)
     
    MathLover1, Feb 27, 2022
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  3. nycmathguy

    nycmathguy

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    Ron Larson does not instruct to use the Perfect Cube Formula. I need to solve it as he instructed in Section 6.6. Cool formula but he said nothing about it.
     
    nycmathguy, Feb 27, 2022
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