What two numbers multiply to -90 and add up to -9?

Here we answer the question: "What two numbers multiply to -90 and add up to -9?"

The answer to your question is:

-15 and 6

Below we illustrate and prove that -15 and 6 multiply to -90 and add up to -9:

-15 × 6 = -90
-15 + 6 = -9

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

x² - 9x - 90 = 0

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

(x - 15 ) (x + 6)

To summarize, since -15 and 6 multiply to -90 and add up -9, you know that the following is true:

x² - 9x - 90 = (x - 15 ) (x + 6)

Multiply To One Number and Add Up To Another
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