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10 cards from this deck
Terms with the same variable parts
Multiply term outside by each term inside
Changes sign of every term inside when expanded
Add the powers
ac+ad+bc+bdac + ad + bc + bdac+ad+bc+bd
a2+2ab+b2a^2 + 2ab + b^2a2+2ab+b2
Square first, square last, twice the product in between
a2−b2a^2 - b^2a2−b2
The middle terms cancel out
Each term in first bracket multiplies each term in second
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