<PRE><B>Question 937693</B>
The problem I would like to solve is: 
7x^2 - 21x - 3 = 0 
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You are correct ; the AC Method does not work on your problem.
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Use the Quadratic Formula::
x = [-b +- sqrt(b^2-4ac)]/(2a)
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x = [21 +- sqrt(441-4*7*-3)]/14
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x = [21 +- sqrt(525)]/14
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x = (21+5sqrt(5))/14 or x = (21-5sqrt(5))/14
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Cheers,
Stan H.
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