SOLUTION: If z1 = 2cis115� and z2 = 3cis65� , write z1z2 in its RECTANGULAR FORM: a + bi.

Question 1117277: If z1 = 2cis115� and z2 = 3cis65� , write z1z2 in its RECTANGULAR FORM: a + bi.
Answer by ikleyn(53751) (Show Source): You can put this solution on YOUR website!
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If z1 = 2cis115� and z2 = 3cis65� , write z1z2 in its RECTANGULAR FORM: a + bi.
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z1*z2 = 2*3*cis(115� + 65�) = 6*cis(180�) = 6*(cos(180�) + i*sin*180�)) = 6*(-1 + i*0) = -6.


I first multiplied in trigonometric/polar form, and then transformed to rectangular form  a+bi = -6    (a = -6, b = 0).

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