Answer:
[tex]x1=-5+\sqrt{2} \\x2=-5-\sqrt{2}[/tex]
Step-by-step explanation:
First we need to simplify your equation by grouping coefficients:
[tex]x^{2} +10x+23=0[/tex]
Now, there are two valid values for your variable, wich are determined by the following expressions:
[tex]x=\frac{-b+\sqrt{b^{2}-4ac } }{2a} \\\\x=\frac{-b-\sqrt{b^{2}-4ac } }{2a}[/tex]
We will call those expression as (eq1) and (eq2) in their respective order
In both scenarios the following is derived from your grouped equation.
[tex]a=1\\b=10\\c=23[/tex]
[tex]x1=\frac{-10+\sqrt{10^{2}-4*1*23 } }{2*1}\\x2=\frac{-10-\sqrt{10^{2}-4*1*23 } }{2*1}[/tex]
[tex]x1=\frac{-10+\sqrt{8 } }{2}\\\\x2=\frac{-10-\sqrt{8} }{2}[/tex]
We can simplify these expressions a little more by doing the following
[tex]x1=\frac{-10+2 \sqrt{2 } }{2}\\\\x2=\frac{-10-2\sqrt{2} }{2}[/tex]
The result is
[tex]x1=-5+\sqrt{2} \\x2=-5-\sqrt{2}[/tex]
We can not simplify these expresions anymore