Use the zero product property to find the solutions to the equation x2 – 15x – 100 = 0.

Factor the quadratic by finding two numbers whose product is −100 and whose sum is −15: −20 and 5. Thus, (x − 20)(x + 5) = 0. By the zero product property, x = 20 or x = −5, which matches choice C, “x = −5 or x = 20.”

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