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First, we open the parentheses and change the sign accordingly.
Since there are only positive numbers inside the parentheses, multiplying by minus will give us negative numbers:
Now we group the x factors:
Now we obtain:
\( 100-(30-21)= \)
The negative sign outside the parentheses acts like multiplying by -1. So -(+4y) becomes -4y, just like how -1 × 4 = -4!
No! The parentheses group terms together. You must distribute the negative sign to every term inside before combining like terms.
Think of it like this: if you have 12 apples and take away 13 apples, you're 1 apple short. So 12x - 13x = -1x or simply -x.
The same rule applies! Distribute the negative to every single term. For example: -(2x + 3y - 5z) = -2x - 3y + 5z
Because we distributed the negative sign to both terms: -(13x + 4y) = -13x and -4y. The +4y became -4y after distribution.
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