Question

How do you factor `25b^2 -60b +36`?

Answer 1

`25b^2 - 60b + 36` is of the form `A^2-2AB+B^2` where `A=5b` and `B=6`.

This is a perfect square trinomial...

`25b^2-60b+36 = (5b)^2-(2xx5bxx6)+6^2`

`=(5b-6)^2`