What two numbers multiply to -128 and add up to -8?

Here we answer the question: "What two numbers multiply to -128 and add up to -8?"

The answer to your question is:

-16 and 8

Below we illustrate and prove that -16 and 8 multiply to -128 and add up to -8:

-16 × 8 = -128
-16 + 8 = -8

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

x² - 8x - 128 = 0

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

(x - 16 ) (x + 8)

To summarize, since -16 and 8 multiply to -128 and add up -8, you know that the following is true:

x² - 8x - 128 = (x - 16 ) (x + 8)

Multiply To One Number and Add Up To Another
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