Mathematics — first biennium · Lesson
The cube comes from multiplying three equal factors: coefficients 1-3-3-1 follow from the products and must be used with the correct signs.
Prerequisites: Square of a binomial
Goal: Derive and apply the cube of a binomial while checking coefficients and signs.
In this lesson: Derive and apply the cube of a binomial while checking coefficients and signs.
How to proceed: A minus sign appears in terms containing an odd power of the second term; the term with b² stays positive.
You can already assume: Square of a binomial.
Completed exercises: 0/5 · Correct on first attempt: 0
A minus sign appears in terms containing an odd power of the second term; the term with b² stays positive.
Data / situation: Expand (x+3)³.
ConceptStep separates what is required from what is recommended or useful as reinforcement. Only required prerequisites block your progress.
Relationships: solid line = required · dashed line = recommended · dotted line = reinforcement.