Quadratic

Find the value of that root.

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$ax^2+bx+c$

In the searched quadratic must apply:   $b^2-4ac=0$

$4x^2 + 16x + 8\ |\ b^2-4ac\neq 0\\ x^2 + 4x + 5\ |\ b^2-4ac\neq 0\\ 9x^2 - 6x + 1\ |\ \color{blue}b^2-4ac=(-6)^2-4\cdot 9\cdot 1=0\\ 2x^2 - 8x + 4\ |\ b^2-4ac\neq 0\\ 225x^2 - 30x + 9\ |\ \color{red}b^2-4ac< 0$  

The searched quadratic function is:

$\color{blue}9x^2 - 6x + 1=0\\ x = {6 \pm \sqrt{36-4\cdot 9\cdot 1} \over 2\cdot 9}\\The\ value\ is\\ \color{blue}x=\dfrac{1}{3}$

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