Check whether the given equation is a quadratic equation.
$x^{2} - 6 x + 4 = 0$

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Solution

Let $p (x) = x^{2} - 6 x + 4 = 0$
$x^{2} - 6 x + 4 = 0$
$\Rightarrow$ A quadratic equation is an equation of the second degree, meaning it contains at least one term that is squared.
$\Rightarrow$ Comparing equation $x^{2} - 6 x + 4 = 0$ with standard form of quadratic equation $a x^{2} + b x + c = 0$ .
$\Rightarrow$ We get, $a = 1, b = - 6, c = 4$
$∴$ The equation $x^{2} - 6 x + 4 = 0$ is quadratic equation.

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