For a quadratic equation of the form \(y = k{(x - a)^2} + b\), the following diagram shows the main properties: If k > 0, the vertex is a minimum turning point If k < 0, the vertex is a maximum ...

4ac\textless0\), the roots are non-real (diagram C) \(= 169\textgreater0\) therefore roots are real and unequal. To solve the quadratic equation, we make \(y = 0\) and since the question already ...