Philip P. answered 05/07/14
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x2 - 7x + 13 = 0
This quadratic does not factor, so use the quadratic formula to find x:
x = (-b/2a) ± (1/2a)√(b2-4ac)
In your equation, a=1, b=-7, and c=13:
x = (-(-7)/2) ± (1/2) √[(-7)2-4(1)(13)]
x = (7 ± i√3)/2