What two numbers multiply to 20 and add up to -9?

Here we answer the question: "What two numbers multiply to 20 and add up to -9?"

The answer to your question is:

-5 and -4

Below we illustrate and prove that -5 and -4 multiply to 20 and add up to -9:

-5 × -4 = 20
-5 + -4 = -9

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

x² - 9x + 20 = 0

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

(x - 5 ) (x - 4)

To summarize, since -5 and -4 multiply to 20 and add up -9, you know that the following is true:

x² - 9x + 20 = (x - 5 ) (x - 4)

Multiply To One Number and Add Up To Another
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