Using the quadratic formula is another method of solving quadratic equations that will not factorise. You will need to learn this formula, as well as understanding how to use it. Key fact The ...

Look at the National 4 factorising section before continuing. When a question asks you to 'solve' a quadratic equation, this means that you are to find the roots of the quadratic. In other words ...

Take the word problem I gave above: it is an example of algorithmic thinking ... This may sound obvious today, but it took three and a half thousand years for mathematicians to move from solving ...