Question

How do you solve `c^2+10c+9=0`?

Answer 1

`c = -1` or `c = -9`

Explanation:

`c^2 + 10c + 9 = 0`
`(c + 1)(c+9) = 0`

`c+1=0` or `c+9 = 0`
`c=-1` or `c=-9`