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How do you solve $x^2-x-1=0$ ?

1 Answer

Jul 5, 2016

$x = 1/2+-(sqrt(5))/2$

Explanation:

Quadratic formula.

$x = (1+-sqrt(1 - 4(1)(-1)))/2 = (1+-sqrt(5))/2$

$x = 1/2+-(sqrt(5))/2$

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