FOIL
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
FOIL — First, Outer, Inner, Last — orders the four products when two binomials multiply.
Show
(x + 3)(x + 5): First x², Outer 5x, Inner 3x, Last 15 — collected, x² + 8x + 15.
Watch for
FOIL is distribution with a memory aid; it works on binomials only.
Builds on
- Nothing — this is a starting point.
Unlocks
- Nothing yet depends on this.