Deriving the Quadratic Formula by completing the square

#Grade9GCSE #DerivingTheQuadraticFormula #ProofQuadraticFormula Here we go through all the steps for deriving the quadratic formula which is a Grade 9 GCSE topic. We use the technique of completing the square to solve the equation ax^2+bx+c=0 and end up with the quadratic formula. My method is slightly different than other creators who prefer to divide by a at the beginning where I like to factorise out the a. This topic is required for GCSE and A-Level. Remember to subscribe for more videos like this