$-\frac{1}{6}$

$\frac{1}{6}$

$-6$

6

$\sqrt{{(-2)}^2}=-2$

${\left(2\sqrt{3}\right)}^2=6$

$\sqrt{2}+\sqrt{3}=\sqrt{5}$

$\sqrt{2}\times \sqrt{3}=\sqrt{6}$

$x+2=3$

$x-2=3$

$x-2=3(2x-1)$

$x+2=3(2x-1)$

$y=4x$

$y=-4x$

$y=x-4$

$y=x^2$