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Khan Academy (English - US curriculum)
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Khan Academy (English - US curriculum)
Math
Precalculus
Rational functions
Adding and subtracting rational expressions
Subtracting rational expressions
Subtracting rational expressions
Sal subtracts and simplifies (a-2)/(a+2) - (a-3)/(a²+4a+4).
License: CC BY-NC-SA by Khan Academy