Polynomials
- Monomial: one term (5x², −3y)
- Binomial: two terms (2x + 3)
- Trinomial: three terms (ax² + bx + c)
Adding/subtracting: Combine like terms (same variable and exponent).
FOIL for two binomials: (a + b)(c + d) = ac + ad + bc + bd
Special products — memorize these: - (a + b)² = a² + 2ab + b² - (a − b)² = a² − 2ab + b² - (a + b)(a − b) = a² − b² ← difference of squares - (a + b)(a² − ab + b²) = a³ + b³ ← sum of cubes - (a − b)(a² + ab + b²) = a³ − b³ ← difference of cubes