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Correct form. 2X^2 - 2X - 1 = 0

- b +/- sqrt(b^2 - 4ac)/2a

quadratic formula

a = 2

b = - 2

c = -1

-(-2) +/- sqrt[(-2)^2 - 4(2)(-1)]/2(2)

2 +/- sqrt( 4 + 8)/4

2 +/- 2sqrt(3)/4

exact answer, less final factoring

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