Respuesta :

Answer: 25

Step by Step Explanation:
1. Isolate the formula so everything is on one side and equal to 0. (-x^2 + 5x=0)
2. The formula used for the discriminant is b^2-4ac.
a=-1, b=5, c=0 sub in those values into the formula.
3. (5)^2 + 4(-1)(0) = 25

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