Expanding means multiplying out the brackets — distribute, then simplify.
Distributive law
a(b + c) = ab + ac
Try it
3(x + 4)
3·x + 3·4 = 3x + 12.
Try it
(x + 2)(x + 3) — FOIL
First: x·x = x². Outer: 3x. Inner: 2x. Last: 6. Sum: x² + 5x + 6.
Expanding means multiplying out the brackets — distribute, then simplify.
3(x + 4)
3·x + 3·4 = 3x + 12.
(x + 2)(x + 3) — FOIL
First: x·x = x². Outer: 3x. Inner: 2x. Last: 6. Sum: x² + 5x + 6.