Algebra
# Partial Fractions

Evaluate $\int_6^{18}\frac{6x^2}{x^3+15x^2+72x+108}dx.$

What is $\int\frac{1}{x^2+7x+6}dx?$

What is $\int\frac{x+6}{x^2-9x+20}dx?$

What is $\int\frac{1}{x^2-16}dx?$