1. The problem statement, all variables and given/known data given |z|=3, Arg(z)=5Pi/6 find a+ib form of the complex number. 2. Relevant equations 3. The attempt at a solution so from the arg(z) we can say it lies in the second quad. Since 5Pi/6 is equivalent to then 180-150 =30 so, 3(sqrt3/2 +1/2i) but they had 3/2(-sqrt3+i) why is it negative? since 150 is in the sec quad.