How do you solve by completing the square and express the answers in simplest radical form: x^2+2x+4=0?

1 Answer
Alan P.
Apr 2, 2015

If x^2+2x are the first 2 terms of a quadratic generated from an expression of the form (x+a)^2
then the the complete form of the quadratic must be
x^2+2x+1

Separate this part of the left side of the given equation and more the excess to the right side by subtracting it from both sides
x^2+2x+1 = -3

Take the square root of both sides
x+1 = +-sqrt(3)

Giving the results
x = -1-sqrt(3)
and
x=-1+sqrt(3)

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