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To verify a calculated root, substitute the value of the root back into the original quadratic equation for the variable $x$. Follow the order of operations to simplify the expression.

Conditions: You have a candidate solution for $x$.; The original quadratic equation is available.

To verify a calculated root, substitute the value of the root back into the original quadratic equation for the variable $x$. Follow the order of operations to simplify the expression.

Conditions: You have a candidate solution for $x$.; The original quadratic equation is available.

To solve a quadratic equation using the quadratic formula, first rewrite the equation in standard form $ax^2 + bx + c = 0$ and identify the coefficients $a$, $b$, and $c$. Substitute these values into the formula $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$.

Conditions: The equation must be in standard quadratic form: $ax^2 + bx + c = 0$.; The leading coefficient $a$ must not be zero ($a \neq 0$).

To solve a quadratic equation using the quadratic formula, first rewrite the equation in standard form $ax^2 + bx + c = 0$ and identify the coefficients $a$, $b$, and $c$. Substitute these values into the formula $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$.

Conditions: The equation must be in standard quadratic form: $ax^2 + bx + c = 0$.; The leading coefficient $a$ must not be zero ($a \neq 0$).