Question

How do you solve `5r ^ { 2} + 10r = 0`?

Answer 1

`r=0" " or" " r=-2`

Explanation:

`5r^2 + 10r =0`

`5r(r+2)=0`

`5r=0" or "(r+2)=0`

If `5r=0, " then, " r=0`

If `(r+2)=0, " then, " r=-2`