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

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

The answer to your question is:

-128 and -1

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

-128 × -1 = 128
-128 + -1 = -129

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

x² - 129x + 128 = 0

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

(x - 128 ) (x - 1)

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

x² - 129x + 128 = (x - 128 ) (x - 1)

Multiply To One Number and Add Up To Another
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