Paula R.

asked • 04/15/14

perform the indicated operation. Write the result in the form of a+bi

(9-6i)(8+3i) =

1 Expert Answer

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Philip P. answered • 04/15/14

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Perform the indicated operation. Write the result in the form of a+bi
(9-6i)(8+3i) =
 
Multiply out just like you would for real number binomials using the FOIL method:
 
(9-6i)(8+3i) = 72 +27i - 48i -18i2
 
Combine like terms and remember that i2 = -1
 
72 -21i +18 = 90-21i
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