What two numbers multiply to 39 and add up to -40?

Here we answer the question: "What two numbers multiply to 39 and add up to -40?"

The answer to your question is:

-39 and -1

Below we illustrate and prove that -39 and -1 multiply to 39 and add up to -40:

-39 × -1 = 39
-39 + -1 = -40

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

x² - 40x + 39 = 0

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

(x - 39 ) (x - 1)

To summarize, since -39 and -1 multiply to 39 and add up -40, you know that the following is true:

x² - 40x + 39 = (x - 39 ) (x - 1)

Multiply To One Number and Add Up To Another
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