# Polynomials

# Multiplication of a Monomial and a Polynomial

The easiest case of polynomial multiplication is multiplying a monomial and a polynomial. In this case, we "distribute" the monomial to each term in the polynomial. We really do distribute it, though. We weren't using the quotation marks to be sarcastic or ironic.

### Sample Problem

What is (2*x*)(3*x*^{2} + 4*x* + 9) ?

We use the distributive property to distribute (2*x*) over the longer polynomial, then simplify the resulting terms.

(2x)(3x^{2} + 4x + 9) | = | (2x)(3x^{2}) + (2x)(4x) + (2x)(9) |

= | 6x^{3} + 8x^{2} + 18 |

### Sample Problem

What is (5*x*^{2})(4*x*^{3} + 7*x*)?

We distribute (5*x*^{2}) to find (5*x*^{2})(4*x*^{3}) + (5*x*^{2})(7*x*),

which simplifies to 20*x*^{5} + 35*x*^{3}.