Let’s rewrite the given equation by adding 81 to both sides: [tex]x^2 - 18x + 81= 65 + 81[/tex] [tex](x - 9)^2 = 146[/tex] Taking the square root of both sides, we get [tex]x - 9 = \pm\sqrt{146}[/tex] or [tex]x = 9 \pm \sqrt{146} = 9 \pm 12.1 = 21.1\:\text{and}\:-3.1[/tex]
