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:

-1 and 90

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

-1 × 90 = -90
-1 + 90 = 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 - 1 ) (x + 90)

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

x² + 89x - 90 = (x - 1 ) (x + 90)

Multiply To One Number and Add Up To Another
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