Solving a cubic equation is similar in some aspects to solving a quadratic equation, factorisation is in action.
In the two videos, I show you the step by step approach I took to solve a cubic equation either by synthetic division or comparing coefficients.
This concept is usually covered in Secondary 3 Additional Maths syllabus under Factor and Remainder Theorem.
Step 1 (same for both methods) : Guess and Check the first factor (with the help of the calculator).
Step 2: Find the Quadratic Factor.
Leave a comment to share with me which method do you prefer or usually use? I look forward to your comment!
Video 1: GCE O-Level A-Maths: Solve a Cubic Equation by Synthetic Division
Direct link: https://www.youtube.com/watch?v=CqCdD9a8q4c
Video 2: GCE O-Level A-Maths: Solve a Cubic Equation by Comparing Coefficients
Direct link: https://www.youtube.com/watch?v=6iqG74I07v4
Ai Ling Ong
Hi, I'm Ai Ling Ong. I enjoy coaching students who have challenges with understanding and scoring in 'O' Level A-Maths and E-Maths. I develop Math strategies, sometimes ridiculous ideas to help students in understanding abstract concepts the fast and memorable way. I write this blog to share with you the stuff I teach in my class, the common mistakes my students made, the 'way' to think, analyze... If you have found this blog post useful, please share it with your friends. I will really appreciate it! :)
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