What two numbers multiply to -640 and add up to 318?

Here we answer the question: "What two numbers multiply to -640 and add up to 318?"

The answer to your question is:

-2 and 320

Below we illustrate and prove that -2 and 320 multiply to -640 and add up to 318:

-2 × 320 = -640
-2 + 320 = 318

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

x² + 318x - 640 = 0

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

(x - 2 ) (x + 320)

To summarize, since -2 and 320 multiply to -640 and add up 318, you know that the following is true:

x² + 318x - 640 = (x - 2 ) (x + 320)

Multiply To One Number and Add Up To Another
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