The distributive law is: . Essentially, the a is “in-multiplied” into the bracket.
To find binomial products, the steps are, using the above as an example:
- Multiply first terms (4y, y), meaning
- Multiply outer terms (4y, 9y), meaning
- Multiply inner terms (-8x, y), meaning
- Multiply last terms (-8x, 9x), meaning
- Simplify, putting together the above