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OpenStudy (anonymous):
-4i(-7i)
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OpenStudy (ranga):
-4 * -7 = +28 i * i = i^2 = -1 So -4i(-7i) = (28) * (-1) = -28.
OpenStudy (anonymous):
i got more
OpenStudy (anonymous):
(5-i)(1-2i)
OpenStudy (ranga):
(5-i)(1-2i) FOIL it. 5*1 -(5)(2i) - (i)(1) + (i)(2i) = 5 - 10i - i + 2i^2 = 5 - 11i + (2)(-1) = 5 - 11i - 2 = 3 - 11i
OpenStudy (anonymous):
3/1+i
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