What is the solution set to the equation x^2+6x+3=0

That is a quadratic equation in which

a = 1

b = 6

c = 3

The quadratic formula is:

x = [-b + - sqr root (b^2 - 4*a*c) ] / 2*a

x = [-6 + - sqr root (36 - 4 * 1 * 3) ] / 2

x1 = [-6 + sqr root (24) ] / 2

x2 = [-6 - sqr root (24) ] / 2