College Algebra / Unit 2 Alg 073 short lesson, about 20 seconds
The Difference of Squares
Captions available
The idea
Multiplying conjugate binomials collapses to a difference of squares: (a + b)(a − b) = a² − b², with no middle term.
In practice
(x + 6)(x − 6): the outer and inner products, −6x and 6x, cancel, leaving x² − 36.
Where people slip
The pattern needs opposite signs and matching terms.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
- Nothing yet depends on this.
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