Question

How do you factor the expression `r^2-4rs+4s^2`?

Answer 1

`r^2 - 4rs +4s^2 = (r - 2s)^2`

Explanation:

`r^2 -4rs + 4s^2`
`" "`
`=r^2 -2 (r)(2s) + (2s)^2`
`" "`
`=(r - 2s)^2`