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In math, like algebra and calculus, a product is special when it is very common and worth knowing.

Some examples area:

(x + y) = ax + ay (Distibutive Law)

(x + y)(x − y) = x2 − y2 (Difference of 2 squares)

(x + y)2 = x2 + 2xy + y2 (Square of a sum)

(x − y)2 = x2 − 2xy + y2 (Square of a difference)

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9y ago

What else can I help you with?