Expanding parentheses rests on the distributive property: a(b+c)=ab+ac.
If there is a plus in front of the parentheses, the signs inside stay the same: +(a−b)=a−b. If there is a minus, flip every sign inside: −(a−b)=−a+b.
Plus in front of parentheses — keep the signs inside
Minus in front of parentheses — flip the signs inside
A factor in front of parentheses multiplies each term inside
Distributive property (reminder)
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