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:

-3 and 43

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

-3 × 43 = -129
-3 + 43 = 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 - 3 ) (x + 43)

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

x² + 40x - 129 = (x - 3 ) (x + 43)

Multiply To One Number and Add Up To Another
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