# Write answer in both rectangular from and polar Q in degre

Hi

4 - write answer in both rectangular from and polar Q in degre

a ) (1 + i ) ( 2+ 2i )
b ) -2 + 2i

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In part (a), you seem to have assumed that (2i)2=4i, which is wrong....(2i)2=-4.

In part (b) you have written: tan-1(2/2), where it should be: tan-1(2/-2). Also I don't understand why you have written: 45-$$\pi$$/4.

Hi