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OpenStudy (anonymous):
(2 + 4⋅i)(-1 + 4⋅i) simplify
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OpenStudy (anonymous):
Use FOIL! :) First, Outer, Inner, Last. You multiply it out:)
OpenStudy (anonymous):
I don't understand the invisible number part, when you multiply 4i*4i what does it become?
OpenStudy (anonymous):
It becomes -16:)
OpenStudy (anonymous):
thank you!!
OpenStudy (anonymous):
No prob:)
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