What two numbers multiply to -129 and add up to -40?

Here we answer the question: "What two numbers multiply to -129 and add up to -40?"

The answer to your question is:

-43 and 3

Below we illustrate and prove that -43 and 3 multiply to -129 and add up to -40:

-43 × 3 = -129
-43 + 3 = -40

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

x² - 40x - 129 = 0

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

(x - 43 ) (x + 3)

To summarize, since -43 and 3 multiply to -129 and add up -40, you know that the following is true:

x² - 40x - 129 = (x - 43 ) (x + 3)

Multiply To One Number and Add Up To Another
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