What two numbers multiply to -90 and add up to -89?

Here we answer the question: "What two numbers multiply to -90 and add up to -89?"

The answer to your question is:

-90 and 1

Below we illustrate and prove that -90 and 1 multiply to -90 and add up to -89:

-90 × 1 = -90
-90 + 1 = -89

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

x² - 89x - 90 = 0

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

(x - 90 ) (x + 1)

To summarize, since -90 and 1 multiply to -90 and add up -89, you know that the following is true:

x² - 89x - 90 = (x - 90 ) (x + 1)

Multiply To One Number and Add Up To Another
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