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Discriminant

Find the valu...

Question

Find the value of discriminant for the following equation.
$x^{2} - 6 x + 7 = 0$

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Solution

The value of discriminant of $x^{2} - 6 x + 7 = 0$ is
$D = b^{2} - 4 a c$
$a = 1, b = - 6, c = 7$
$∴ D = (6)^{2} - 4 \times 7 \times 1$
$= 36 - 28$
$= 8$

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