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Khan Academy (English - US curriculum)
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Khan Academy (English - US curriculum)
Math by grade
Eureka Math/EngageNY
Algebra 1 (Eureka Math/EngageNY)
Module 4: Polynomial and quadratic expressions, equations, and functions
Topic A: Lessons 3-4: Special forms
Factoring perfect squares
Factoring perfect squares
Sal factors 25x^2-30x+9 as (5x-3)^2 or as (-5x+3)^2.
License: CC BY-NC-SA by Khan Academy