What two numbers multiply to -90 and add up to -1?

Here we answer the question: "What two numbers multiply to -90 and add up to -1?"

The answer to your question is:

-10 and 9

Below we illustrate and prove that -10 and 9 multiply to -90 and add up to -1:

-10 × 9 = -90
-10 + 9 = -1

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

x² - 1x - 90 = 0

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

(x - 10 ) (x + 9)

To summarize, since -10 and 9 multiply to -90 and add up -1, you know that the following is true:

x² - 1x - 90 = (x - 10 ) (x + 9)

Multiply To One Number and Add Up To Another
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