$x^2-3x+2.5=\left(x-3\right)^2+0.5\left(x-18\right)$
$17^{-1}\cdot17^2$
$\frac{4x}{2}+3^2$
$\lim_{x\to\pi}\left(\cos\left(x\right)+\sin\left(x\right)\right)\tan^x$
$7\cdot7^{x-4}+4=2$
$\sec\left(x\right)=-\frac{3}{2}$
$-3x^2-7x+1\:\:x=1$
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