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OpenStudy (anonymous):
Simplify the following product of complex numbers. (9 – 4i) · (-8 + 5i)
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sam (.sam.):
Use FOIL
OpenStudy (anonymous):
i tried
sam (.sam.):
-72+45i+32i-20i^2 -72+77i-20i^2 (i^2 is -1) -72+77i-20(-1) -72+77i+20 -52+77i
OpenStudy (anonymous):
thanks
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