Question

How do you factor the trinomial `r^2 + 17r + 72`?

Answer 1

`r^2+17r+72=(r+8)(r+9)`

Explanation:

`r^2+17r+72`

Find two numbers that when added equal `17` and when multiplied equal `72`. The numbers `8` and `9` meet the criteria.

Rewrite the expression as `(r+8)(r+9)`.