How do you solve #x^2+8x+18 = 0# by completing the square?
To complete the square, we need the perfect square of the equation of
We get 16, which means that we must change our current equation to have a 16.
By subtracting 2 from both sides, we get that 16. Now, we can simplify the left hand side into the perfect square
We now square root both side, giving us
They can never be a negative square root, so therefore there is no answer.