In a quadratic expression, the highest power of \(x\) is \(x^2\). Factorise \(x^2 + 7x + 10\). To factorise this expression, find two numbers that have a product of +10 and a sum of +7.

7. Where the graph crosses the line \({y}\) = 0 we will have our solutions. As the graph is quadratic we can see that the line crosses the \({x}\)-axis twice, once at \({x}\) = -7 and once at \({x}\) ...