$k^2-6k+9$

$f^{\prime}\left(x\right)=\frac{2}{3}\left(x+\ln x\right)^{\frac{1}{2}}\left(1+\frac{1}{x}\right)$

$\lim_{x\to5}\left(\frac{x^2+x-12}{x^2-5x+6}\right)$

$\log\left(x+3\right)=\log\left(x\right)$

$x^2+8x+7=0$

$\int\:\:v^{-2}\left(2v^4+3v^2-2v^{-3}\right)dv$

$\int\frac{x+2}{x^2+x-6}dx$