Area between a cubic and the line y=x

Let $f:\mathbb{R}\to\mathbb{R}$ and $g:\mathbb{R}\to\mathbb{R}$ be given by $f(x)=x^3+2x^2-15x$ and $g(x)=x$ respectively. Let $x_0$ be the smallest strictly positive number such that $f(x_0)=0$. Then the area of the region enclosed by the graphs of $f$ and $g$ between the lines $x=0$ and $x=x_0$ is __________ (round off to 2 decimal places)