6.1 Areas Between Curves/5

${\begin{aligned}&\color {red}\mathbf {y=x+1} &\color {royalblue}\mathbf {y=9-x^{2}} \\&x=-1&x=2\\\end{aligned}}$

Failed to parse (unknown function "\begin{align}"): {\displaystyle \begin{align} \int_{-1}^{2}[(9-x^{2}) - (x+1)] dx = [(9x-\frac{x^{3}}{3}-\frac{x^{2}}{2}-x)]\Bigg|_{-1}^{2} \\[2ex] &= \left[9(2)-\frac{(2)^{3}}{3}-\frac{(2)^{2}}{2}-(2)-(9(-1)-\frac{(-1)^{3}}{3}-\frac{(-1)^{2}}{2}-(-1))] \\[2ex] &= \left18-\frac{8}{3}-2-2+9-\frac{1}{3}+\frac{1}{2}-1 \\[2ex] &= 19.5 \\[2ex] \end{align} }