2 thoughts on “Challenging Complex number problem 4”

Hi mr Goh. Just to double check. I used trigo for this question, the two points and origin form an isosceles triangle with angle 2pi/5, then used the midpoint of the locus z1 – z2 to find the length of midpoint to one of the points then multiply by 2. Do you think it is ok?

Hi mr Goh. Just to double check. I used trigo for this question, the two points and origin form an isosceles triangle with angle 2pi/5, then used the midpoint of the locus z1 – z2 to find the length of midpoint to one of the points then multiply by 2. Do you think it is ok?

Sure. It is ok. Using geometry is a good method.