The original equation was and you used the quadratic formula to find x= -1 and x= -1/4 as solutions so that the factors are .
Now there are two ways to go:
1) You can multiply those factors to get . You can then multiply both sides of that equation by 4 to get .
2) As Shakarri said, you can immediately multiply both sides of by 4 to get . Then multiply that to get .