• ### Conjugate Zeros Theorem

If P(x) is a polynomial with real coefficients, and if a + bi is a zero of P, then a - bi is a zero of P.

• ### Factor Theorem

If P(x) is a polynomial and P(a) = 0, then x - a is a factor of P(x). In other words, if the remainder when P(x) is divided by x - a is 0, then x - a is a factor of P(x).

• ### Fundamental Theorem of Algebra

Every polynomial function of positive degree with complex coefficients has at least one complex zero.
Corollary. Every polynomial function of positive degree n has exactly n complex zeros (counting multiplicities).

• ### Multiplicity

A function with n identical roots is said to have a zero of multiplicity n.

• ### Nested Form

The form of a polynomial P(x) = (((((a)x + b)x + c)x + d )x + ... ).

• ### Rational Zeros Theorem

If P(x) is a polynomial with integer coefficients and if is a zero of P(x) (if P( ) = 0), then p is a factor of the constant term of P(x) and q is a factor of the leading coefficient of P(x).

• ### Remainder Theorem

When a polynomial P(x) is divided by x - a, the remainder is equal to P(a).

• ### Root

A number that, when plugged in for the variable, sets a function equal to zero. Also called a zero.

• ### Synthetic Division

A process by which a polynomial is divided by a binomial, in which the coefficients of the polynomial are placed in a row and multiplied by and added to the constant divisor as in nested form.

• ### Zero

A number that, when plugged in for the variable, sets a function equal to zero. Also called a root.