$6x^2+11x+4=0$
$x\left(4\right)-12\cdot x\left(2\right)+x-1$
$4x^2-2x-23$
$\left(15n-\frac{1}{3}m\right)^2$
$\frac{2-1}{-\frac{1}{3}}+\frac{\frac{1}{2}-2}{\frac{1}{4}}+5\left(-1\right)$
$\left(2a\:-\:1\:\right)\left(\:2a\:+\:9\right)\:=\:$
$x^2+10=6x$
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