$\left(x+2\right)\left(x-1\right)\left(x^2+1\right)+1$
$\lim_{x\to\infty}\left(\frac{x+7}{x+5}\right)^{4x-3}$
$150+100+75-70-35-20$
$\frac{1-b^2}{\left(1+bx\right)2+\left(b+x\right)2}$
$-4y-2y^2$
$400+r=150$
$\int\left(\frac{5}{1900-10x}\right)dx$
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