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OCW Scholar - Single Variable Calculus 14 Online
OpenStudy (anonymous):

why does 1+x^2- (1+(x+ ∆x)^2) evaluate to 1+x^2- 1 - x^2-2x∆x-∆x^2 specifically why do all the minus signs carry through (x+ ∆x)^2

OpenStudy (noelgreco):

The Distributive Property of multiplication over addition

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