Here is a clip to explain how to sketch the derivative function from the original graph. It will be a lot easier further down the line when you will happily differentiate and just sketch the graph(no doubt on the calculator). However
Inspired by an amazing student Also see revision notes.
For those students who get to the most difficult questions even The Magic Square has difficulty. Here is the solution to a more challenging quadratic factorising question
A couple of lessons on factorising quadratic expressions, see lesson 2 for The Magic Square method. Lesson 1 – the number before the squared term is 1. Lesson 2 – A bit trickier now, the number before the squared term