What two numbers multiply to -129 and add up to -128?

Here we answer the question: "What two numbers multiply to -129 and add up to -128?"

The answer to your question is:

-129 and 1

Below we illustrate and prove that -129 and 1 multiply to -129 and add up to -128:

-129 × 1 = -129
-129 + 1 = -128

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

x² - 128x - 129 = 0

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

(x - 129 ) (x + 1)

To summarize, since -129 and 1 multiply to -129 and add up -128, you know that the following is true:

x² - 128x - 129 = (x - 129 ) (x + 1)

Multiply To One Number and Add Up To Another
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