$\frac{dy}{dx}+y-x^2-2x=0$
$\left(-5\right)-3+\left\{4-\left(2+\left(3-5\right)-\left(-7\right)\right)+2\right\}-6$
$y=\frac{1}{2}x$
$-\int\frac{x}{\sqrt{4+x^2}}dx$
$\sec^2\left(\frac{x}{2}\right)\left(\frac{1}{2}\right)$
$x^2+124x+49=1000$
$5\cdot16$
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