$\lim_{x\to\infty}\left(x^4\cdot e^{-x}\right)$
$50\cdot24$
$\left(-25\right)\cdot\left(+40\right)\cdot0$
$a^2+b^3-c^4+d^3;\:c=4;\:d=5;\:a=2;\:b=3$
$25x^2-5x\:-16$
$\left(x+ax\right)^2$
$3x^2+6x+3^2$
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