the sWe have the next quadratic formula:
[tex]x²-12x+85=0[/tex]Use the form x²+bx+c
Where:
a=1
b=-12
c=85
Then,
[tex]\begin{gathered} x=\frac{-(-12)\pm\sqrt{(-12)^2-4(1)(85)}^{}}{2(1)} \\ \end{gathered}[/tex][tex]x=\frac{12\pm14i}{2}[/tex][tex]\begin{gathered} x=\frac{2(6+7i)}{2} \\ x=6+7i \end{gathered}[/tex]Hence, the correct answer is option A.
