Question

Question #56298

Answer 1

`r^2+4r+1 = 0`

`color(red)(r^2+4r+2^2) -2^2 +1 =0 " insert appropriate value to make into a square"`

`color(red)((r+2)^2) -3 = 0`

`(r+2)^2 = 3`

`r+2 = +-sqrt(3)`

`r = -2 +-sqrt(3)`