The quadratic formula for a quadratic equation in the form ... so the equation has no real solutions. The graph of \(y = x^2 + 2x + 5\) does not cross or touch the x-axis as the equation \(x ...

Where the graph crosses the line \({y ... these would be incredibly difficult to factorise so the quadratic formula is used. Key fact When solving quadratics in exams it is common for the ...