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

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

The answer to your question is:

-8 and -1

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

-8 × -1 = 8
-8 + -1 = -9

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

x² - 9x + 8 = 0

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

(x - 8 ) (x - 1)

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

x² - 9x + 8 = (x - 8 ) (x - 1)

Multiply To One Number and Add Up To Another
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