What two numbers multiply to -9 and add up to -8?

Here we answer the question: "What two numbers multiply to -9 and add up to -8?"

The answer to your question is:

-9 and 1

Below we illustrate and prove that -9 and 1 multiply to -9 and add up to -8:

-9 × 1 = -9
-9 + 1 = -8

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

x² - 8x - 9 = 0

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

(x - 9 ) (x + 1)

To summarize, since -9 and 1 multiply to -9 and add up -8, you know that the following is true:

x² - 8x - 9 = (x - 9 ) (x + 1)

Multiply To One Number and Add Up To Another
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