Integrating Using Substitution Practice Test

$-\dfrac{1}{(x^2+7x+1)^3}+C$

$\dfrac{1}{3(x^2+7x+1)^3}+C$

$\ln|x^2+7x+1|+C$

$-\dfrac{2x+7}{3(x^2+7x+1)^3}+C$

$-\dfrac{1}{3(x^2+7x+1)^3}+C$