Algebra 2 Formulas - Fall

Here is a set of flashcards that will give you some important formulas you should have memorized for your midterms.

Quadratic Formula

x=(-b +- rad(b² - 4ac) / 2a)

Discriminant

x = b² - 4ac

Discriminant (2 real answers)

x > 0

Discriminant (2 non-real answers)

x < 0

Discriminant (1 real answer)

x = 0

Difference of Squares

a² - b² = (a - b)(a + b)

Arithmetic Sequence (recursive)

a_n = {1, n=1

a_n = {a_n-1 - d, n>1

Arithmetic Sequence (explicit)

a_n = a₁ + d(n - 1)

Sum of Arithmetic Series

S_n = (n/2)(a_{1 +} a_n)