This equation is the same as the general equation of a circle, it's just written in a different form. Example Find the equation of the circle with centre \((2, - 3)\) and radius \(\sqrt 7\).

The bottom part is a graph of the equation, which, as you can see, is exactly the same. To be fair, this equation cheats a little bit. You may notice that the y-axis of that graph begins at ‘k’.

Solving quadratic equations - Eduqas Graphs of quadratic functions. ... Draw the graph of \(y = x^2 -x - 4 \) and use it to find the roots of the equation to 1 decimal place.