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Section 6.6
Power of a Complex Number...4
- Thread starter nycmathguy
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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
= \(-43sqrt(5)+4*i\)
= \(-96.151 +4* i\)
- Joined
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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
= \(-43sqrt(5)+4*i\)
= \(-96.151 +4* i\)
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.
