Solve LaTeX: \displaystyle x^{2} + 26 x + 178 = 0

Using the quadratic formula gives LaTeX: \displaystyle x=\frac{ -(26)\pm \sqrt{ (26)^2 -4(1)(178) } }{ 2(1) }
Simplifying gives LaTeX: \displaystyle x=\frac{ -26 \pm \sqrt{ -36 } }{ 2 } = -13 \pm 3 i