Worked Solution for STEP 2 2020, Question 7

This is another worked solution for the Cambridge STEP (Sixth Term Examination Paper) exam paper.

[@moosemorse1]

Can you explain how you squared modulus(w-c)^2

[@NathanaelKoh]

Thanks for asking!
|a/b| = |a|/|b|
|x+yi|^2 = x^2+y^2 (by Pythagoras)
|(x+yi)/(z+wi)| = (x^2+y^2)/(z^2+w^2)
Now you know how to find the modulus squared of any complex fraction!

[@sterlingingram6875]

🙂 Promo>SM