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:

-5 and 18

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

-5 × 18 = -90
-5 + 18 = 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 - 5 ) (x + 18)

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

x² + 13x - 90 = (x - 5 ) (x + 18)

Multiply To One Number and Add Up To Another
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