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The discriminant, because it helps you to discriminate between the type (and number) of roots.

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Q: What is b squared minus 4ac called in the quadratic formula?
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How do you factorise 12x squared minus 9x minus 14?

With the help of the quadratic equation formula


What is the answer to 4z squared minus 16z minus 18?

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Using the quadratic formula to solve any quadratic equation is the best way of getting around it because the quadratic formula is "the opposite of b plus or minus the square root of b squared minus 4ac all divided by 2a. This formula only works with trinomials and second degree equaitons. If the equation is a binomial, then put in a placeholer (0) and substitute them into the equation.


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15