Writing \(y = x^2 – 6x + 4 \) in completed square form gives \(y = (x – 3)^2 – 5\) Squaring positive or negative numbers always gives a positive value. The lowest value given by a squared ...

Save guides, add subjects and pick up where you left off with your BBC account. The graphs of \(y = 2x + 1\) and \(y = 2x - 2\) are shown below. The graph of \(y = 2x + 1\) crosses the \(y\)-axis ...