Complex No. (1 Viewer)

[Lukybear]

I have this question. Find the modolus and argument of each of hte compelx no. z1=2i and z2= 1 + sqrt3i. Mark on an argand diagram the points P,Q,R and S representing z1, z2, z1+z2, and z1-z2 respectively. Deduce the exact values of arg(z1+z2) and arg(z1-z2)

For this question, the solutions provided are done algebracally. However, cant we just tan^-1? and convert to radians. Will that be accepted in exam?

 

[gurmies]

I have this question. Find the modolus and argument of each of hte compelx no. z1=2i and z2= 1 + sqrt3i. Mark on an argand diagram the points P,Q,R and S representing z1, z2, z1+z2, and z1-z2 respectively. Deduce the exact values of arg(z1+z2) and arg(z1-z2)

For this question, the solutions provided are done algebracally. However, cant we just tan^-1? and convert to radians. Will that be accepted in exam?

Do you mean maybe geometrically?

 

[khorne]

Unless specifically stated in the question (like, on an argand diagram) you can use whichever method you like, as long as it provides the correct answer.