MATSEC AM Pure Mathematics Complete Prep Course — Lesson 58: Square roots of a complex number

Sarah Mitchell teaches the standard method for square-rooting a complex number: set the quantity a plus b i squared equal to z, expand, and equate real and imaginary parts to get a squared minus b squared and two a b. She works minus eight plus six i, shows why the negative root of the quadratic in a squared is discarded, adds the modulus shortcut, and drills the sign-pairing trap on three plus four i and five minus twelve i.

Lesson 58 of 158 in the MATSEC AM Pure Mathematics Complete Prep Course audio course from ExamPrepRise.

• Watch the video course (exampreprise.com/courses/mt-matsec-am-pure-mat…)
• Free practice questions (exampreprise.com/practice/mt-matsec-am-pure-ma…)

Always confirm the current test plan, eligibility rules, fees and scheduling details with the official test provider before you register.