What two numbers multiply to -90 and add up to -13?

Here we answer the question: "What two numbers multiply to -90 and add up to -13?"

The answer to your question is:

-18 and 5

Below we illustrate and prove that -18 and 5 multiply to -90 and add up to -13:

-18 × 5 = -90
-18 + 5 = -13

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

x² - 13x - 90 = 0

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

(x - 18 ) (x + 5)

To summarize, since -18 and 5 multiply to -90 and add up -13, you know that the following is true:

x² - 13x - 90 = (x - 18 ) (x + 5)

Multiply To One Number and Add Up To Another
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