SOLUTION: Perform the indicated operations. write the answer in the form a + bi. (-3-8i)(-3+8i) Thank you

Question 138193This question is from textbook
: Perform the indicated operations. write the answer in the form a + bi.
(-3-8i)(-3+8i)

Thank you This question is from textbook

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Perform the indicated operations. write the answer in the form a + bi.
(-3-8i)(-3+8i)
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You could use FOIL but you should see the problem in in the form
(a-b)(a+b) which equals a^2 - b^2
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So your answer is (-3)^2 - (8i)^2 = 9+64=73
In other words (a-bi)(a+bi) = a^2 + b^2
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Cheers,
Stan H.
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