perla713 perla713

04-03-2014
Mathematics

contestada

Simplify (7-5i)(-3+9i)-(5+6i)^2

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Mecka123 Mecka123

04-03-2014

(-21 + 63i + 15i - 45i^2) - (25 + 60i + 36i^2) =

(-21 + 78i + 45) - (-11 + 60i) =

24 + 78i - 60i + 11 =

35 + 18i

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