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posted by jenny on Monday, October 15, 2012 at 4:52pm.
x3+6x2+18x+13=0
unless ±1 or ±13 is a root, you're stuck. It's easy to show that -1 is a root. So, you have (x+1)(x^2+5x+13) Now you gotta solve the quadratic, but that's old hat by now.
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