Your answer would be x= 3 - square root of 14 and x= 3 + square root of 14.
STEPS:
Find half of 6, then square it. Add this to each side.
x^2+6x+9=14
Then the square root of (x+3)^2 equals the square root of 14. This would give you the answers x= 3 plus or minus square root of 14.
