Save guides, add subjects and pick up where you left off with your BBC account. Plot points with coordinates where \(x\) and \(y\) are equal. Three points are sufficient, but more can be plotted.

so the graph will be a positive U-shaped curve. Writing \(y = x^2 – 6x + 4 \) in completed square form gives \(y = (x – 3)^2 – 5\) Squaring positive or negative numbers always gives a ...