What two numbers multiply to 615 and add up to -128?

Here we answer the question: "What two numbers multiply to 615 and add up to -128?"

The answer to your question is:

-123 and -5

Below we illustrate and prove that -123 and -5 multiply to 615 and add up to -128:

-123 × -5 = 615
-123 + -5 = -128

Are you asking because you are trying to figure out how to factor the following quadratic equation?

x² - 128x + 615 = 0

If so, the solution to factor the quadratic equation above is:

(x - 123 ) (x - 5)

To summarize, since -123 and -5 multiply to 615 and add up -128, you know that the following is true:

x² - 128x + 615 = (x - 123 ) (x - 5)

Multiply To One Number and Add Up To Another
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