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OpenStudy (anonymous):
Evaluate the expression and write the result in the form a + bi. (−4 + i)(4 − 5i)
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OpenStudy (anonymous):
Foil it out.
OpenStudy (anonymous):
If you see an \(i^2\) replace it with a (-1)
OpenStudy (anonymous):
im not sure. what does it come out too
OpenStudy (lalaly):
-16 +20i +4i+20 = 24i +4
OpenStudy (anonymous):
(-4 + i) (4 - 5 i) = -16 + 20 i + 4 i - 5 (i^2) = -11 + 24 i
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