4 resources.
How the zeroes of a quadratic polynomial relate to its coefficients, plus building a polynomial from a given sum and product of zeroes.
Dividing one polynomial by another to find a quotient and remainder, and using that to find missing zeroes, with worked examples.
Using the Remainder Theorem to find a remainder without dividing, and factoring with the sum/difference-of-cubes identities, with worked examples.
What makes an expression a polynomial, the monomial/binomial/trinomial distinction, and how to find the degree of a polynomial in one or more variables.