<PRE><B>Question 138193</B>
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.</PRE>