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Khan Academy (English - US curriculum)
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Khan Academy (English - US curriculum)
Math by grade
High school
Algebra 1
Quadratics: Multiplying & factoring
Factoring quadratics with perfect squares
Factoring perfect squares: negative common factor
Factoring perfect squares: negative common factor
Sal factors -4t^2-12t-9 as -1(2t+3)^2.
License: CC BY-NC-SA by Khan Academy