Question

How do you factor completely `40xy^2 − 36x^2y`?

Answer 1

`40xy^2-36x^2y = 4xy(10y-9x)`

Explanation:

Note that both of the terms are divisible by `4`, `x` and `y`, so therefore by `4xy`.

Separate this out as a factor:

`40xy^2-36x^2y = 4xy(10y-9x)`