The function is  and  to .

Area of the region:

If  is continuous and non-negative on the closed interval ,

then the area of the region bounded by the graph , the -axis and the vertical lines  and is given by

Area.

Re-write the expression

Consider .

Partial decomposition of the function:

Compare  coefficients.

Compare constants.

Substitute  in .

Substitute  and  in partial decomposition.