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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 B: Lessons 11-13: Completing the square
Worked example: Rewriting expressions by completing the square
Worked example: Rewriting expressions by completing the square
Sal rewrites x²+16x+9 as (x+8)²-55 by completing the square.
License: CC BY-NC-SA by Khan Academy