To multiply two rational expressions, factor them. Then multiply their numerators and denominators, crossing out any factors that appear in both the numerator and the denominator of the answer.

Example 1: × =?

= ×
=
= .

Example 2: × =?

= ×
=
= .

To divide by a rational expression, multiply by its reciprocal.

Example 1: ÷ =?

= ×3x²-2xx²-2x+4
= ×x(3x-2)x²-2x+4
=
= .

Example 2: ÷ =?

= ×
= ×
=
= .