Mathematics, 06.10.2019 04:01, erinharrington15
If neither a nor b are equal to zero, which answer most accurately describes the product of (a + bi)(a - bi)?
the real part is not positive.
the imaginary part is positive.
the real part is zero.
the imaginary part is zero.
Answers: 1
![P\\\\=(a+bi)(a-bi)\\\\=a^2-(bi)^2\\\\=a^2-b^2i^2\\\\=a^2-b^2\times (-1)~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~[\textup{since }i^2=-1]\\\\=a^2+b^2.](/tpl/images/0292/0057/1f968.png)
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If neither a nor b are equal to zero, which answer most accurately describes the product of (a + bi)...
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