



 
Hi Itsel, You can find the quadratic formula in Steve's response to a question from Stuart a few years ago. Stuart's quadratic was $3x^2 5x  4 = 0.$ The discriminant is the piece of the quadratic formula under the root sign, that it it is $b^2  4 a c.$ Thus for Stuart's quadratic the discriminant is \[b^2  4 a c = (5)^2  4 \times 3 \times (4) = 25 + 48 = 73.\] Penny
 


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