Number brackets

Number brackets are brackets that are a number with a certain sign. For example: $(-3)$.

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Hint

You can omit the number bracket and the sign if the numbers are positive. For example: $(+4)=4$

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Remember

When you expand number brackets,

and you have the same signs, you put a plus sign
and you have different signs, you put a minus sign next to each other.

Examples

same signs: $\color{green}{+}$

$8\color{green}{+}(\color{green}{+}3)=8\color{green}{+}3$
$9\color{red}{-}(\color{red}{-}3)=9\color{green}{+}3$

different signs: $\color{red}{-}$

$8\color{red}{-}(\color{green}{+}2)=8\color{red}{-}2$
$7\color{green}{+}(\color{red}{-}3)=7\color{red}{-}3$