What two numbers multiply to -640 and add up to 156?

Here we answer the question: "What two numbers multiply to -640 and add up to 156?"

The answer to your question is:

-4 and 160

Below we illustrate and prove that -4 and 160 multiply to -640 and add up to 156:

-4 × 160 = -640
-4 + 160 = 156

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

x² + 156x - 640 = 0

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

(x - 4 ) (x + 160)

To summarize, since -4 and 160 multiply to -640 and add up 156, you know that the following is true:

x² + 156x - 640 = (x - 4 ) (x + 160)

Multiply To One Number and Add Up To Another
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