How do you solve $x^2 + 5x + 1 = 0$ using the quadratic formula?

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How do you solve $x^2 + 5x + 1 = 0$ using the quadratic formula?

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Answer 1 · 2016-07-20T04:30:13

$(-5 +- sqrt21)/2$

Explanation:

Use the improved quadratic formula (Google, Yahoo Search).
$D = d^2 = b^2 - 4ac = 25 - 4 = 21$ --> $d = +- sqrt21$
There are 2 real roots:
$x = -b/(2a) +- d/(2a) = -5/2 +- sqrt21/2 = (-5 +- sqrt21)/2$

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How do you solve $x^2 + 5x + 1 = 0$ using the quadratic formula?

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