Go ! $2+3\cdot 4 $ = 2+12 = 14 $2\cdot 2 - 2 $ = $2 - 2\cdot 2 $ = $2\cdot 4 - 3\cdot 2 $ = $(-2)\cdot 4 - (+3)\cdot(-2) $ = $-(-2)\cdot(-4) + (+3)\cdot(-2) $ =