Paper 1 · Complex Numbers
⏱ Tested in 5 exam questions since 2016
Lesson 8 of 17
Complex Numbers 8 – Quadratic equations
This tutorial is for members
Read the lesson notes free below — subscribe to watch the full worked video and download the PDF.
Subscribe for full access · €199/yrYou’ll learn
- Solve quadratics with negative discriminants using the −b formula
- Use the conjugate-pair theorem: real coefficients mean complex roots come in pairs
- Find an unknown coefficient via z² − (sum)z + (product) = 0 or by subbing the known root
- Apply the −b formula when coefficients are non-real, where conjugate pairing fails
Most recent exam questions
- 2024 P1 Q2(a)
- 2023 P1 Q3(b) — deferred
- 2023 P1 Q4(a)
- 2019 P1 Q5(a)
- 2016 P1 Q1(a)
💬 Stuck on something in this lesson?
Send your question with this lesson’s name attached — you’ll get a reply by email.