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Roots of Quadratic Equation

Determine whe...

Question

Determine whether $x = 2$ is a root of the quadratic equation
$x^{2} + x - 1 = 0$

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Solution

Equation: $x^{2} + x - 1 = 0$
Put $x = 2$ in the equation,
Then, $4 + 2 - 1 = 5 \neq 0$
Since, the remainder is $5$
So, $x = 2$ is not the root of the equation.

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