Question 0111b

Given that the curve with equation ${y=f(x)}$ passes through the points with coordinates ${(-1.2, -1.1),}$ ${(0.8, -4.4)}$ and ${(4.9, 10.5),}$ find the values of ${a,b}$ and ${c.}$ Give your answers correct to 3 decimal places.

Find the set of values of ${x}$ for which ${f(x)}$ is an increasing function.