[tex]x-5 \sqrt{x} +4=0[/tex] We can do quadratic equation but the result would be the square root of x [tex] \frac{5±\sqrt{25-16} }{2} = \sqrt{x} [/tex] the possible values for the square root of x is either 4 or 1, we square the numbers so x is either 16 or 1
