Question

How do you factor `r^ { 4} - 5r ^ { 3} + 4r ^ { 2}`?

Answer 1

See a solution process below:

Explanation:

First, factor out an `r^2` from each term:

`(r^2 * r^2) - (r^2 * 5r) + (r^2 * 4) =>`

`r^2(r^2 - 5r + 4)`

Now, factor the expression within the parenthesis as:

`r^2(r - 4)(r - 1)`