0
X2 - 2X - 8 = 0
X = - b (+/-) sqrt(b2 - 4ac)/2a
a = 1
b = - 2
c = - 8
X = - (- 2) (+/-) sqrt[(- 2)2 - 4(1)(- 8)]/2(1)
\
X = 2 (+/-) sqrt(4 + 32)/2
X = 2 (+/-) sqrt(36)/2
X = [2 (+/-) 6}/2
X = 4
=====
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