What two numbers multiply to 640 and add up to -56?

Here we answer the question: "What two numbers multiply to 640 and add up to -56?"

The answer to your question is:

-40 and -16

Below we illustrate and prove that -40 and -16 multiply to 640 and add up to -56:

-40 × -16 = 640
-40 + -16 = -56

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

x² - 56x + 640 = 0

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

(x - 40 ) (x - 16)

To summarize, since -40 and -16 multiply to 640 and add up -56, you know that the following is true:

x² - 56x + 640 = (x - 40 ) (x - 16)

Multiply To One Number and Add Up To Another
Did you find the information on this page useful? Here you can solve a similar problem.