Higher November 2023 Paper 3 Q17

17 Here is a sketch of the quadratic graph \(\quad y = \mathrm{f}(x)\)

The graph crosses the \(x\)-axis at \(\;x = a\;\) and \(\;x = b\)

Sketch of a U-shaped parabola crossing the positive y-axis and crossing the x-axis at a and b, both positive, with a less than b

Write an expression for the \(x\)-coordinate of the turning point. [1 mark]