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First, we open the parentheses and change the sign accordingly.
Since there are only positive numbers within the parentheses, multiplying by the minus will give us negative numbers:
Now we group the X factors:
Now we obtain:
\( 100-(5+55)= \)
The negative sign in front of parentheses acts like multiplying by -1. So -(7x+3y) means -1(7x+3y) = -7x + (-3y) = -7x - 3y.
Think of the negative sign as a distribution truck that must visit every term inside the parentheses. No term gets left behind!
The rule stays the same! If you have -(2x+5y-3z), distribute the negative to get -2x-5y+3z. Every single term changes sign.
No! You can only combine like terms that have the same variable. 3x and 3y are different variables, so they stay separate as -4x-3y.
3x-7x = -4x because both terms have the same variable x. But 3x-3y cannot be simplified further because x and y are different variables.
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