Question

How do you multiply `(5b - 3) ( 3b - 5)`?

Answer 1

`15b^s -34b-15`

Explanation:

Let's say `5b` is a, `-3` is b, `3b` is c and `-5` is d
We always have to multiply `a` by `c`, then `a` by `d`, then `b` by `c`, then `b` by `d`.
AKA `ac`, `ad`, `bc`, `bd`
`ac` would equal `5b * 3b` , which is equal to `15b^2`.

`ad` would equal `5b * -5` , which is equal to `-25b`

`bc` would equal `3b *-3` , which is equal to `-9b`

`bd` would equal `-3*-5` , which is equal to `-15`

Add 'em all together and you get `15b^2 -25b-9b-15`.
Simplify and you get `15b^s -34b-15`