$144x^2+24xy+y^2$

$-8^2+\left(6-9\right)^2$

$\lim_{x\to\infty}\left(\frac{\left(1+x+x^4\right)}{\left(x^2+2x^3-6x^4\right)}\right)^3$

$f\left(-x\right)=\frac{\left(x^2+4x\right)}{\left(x^3+7\right)}$

$25t^2-45t+9$

$\left(2^2\right)^{-1}\cdot2^2$