Minus bracket

If a minus sign is in front of the bracket, you call it a minus bracket.

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Hint

You can think of a (-1) in front of the bracket instead of the minus sign. Each member within the bracket is then multiplied by (-1).

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Remember

If you expand or factorize a minus bracket, the signs change from all factors.

$-(a+b)=(-1)\cdot (a+b)= -a-b$

Examples

$-(-x+y)$
$=(-1)\cdot (-x+y)$
$=(-1)\cdot(-x)+(-1)\cdot y$
$=+1x+(-1y)$
$=x-y$

$-(8x-2)$
$=(-1)\cdot (8x-2)$
$=(-1)\cdot 8x+(-1)\cdot (-2)$
$=-8x+2$

$-5x+18z$ $=-(5x-18z)$