Use a quadratic equation to find two numbers that have a sum of 9 and a product of 20.

Please here your equation is:

Z^2 - 9Z +20 =0

using the standard formula, I get:

Z = (9 +/- sqrt(81-80)/2 = (9 +/- 1)/2

so your numbers are:

Z = 5, and Z = 4

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