What two numbers multiply to -91 and add up to 90?

Here we answer the question: "What two numbers multiply to -91 and add up to 90?"

The answer to your question is:

-1 and 91

Below we illustrate and prove that -1 and 91 multiply to -91 and add up to 90:

-1 × 91 = -91
-1 + 91 = 90

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

x² + 90x - 91 = 0

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

(x - 1 ) (x + 91)

To summarize, since -1 and 91 multiply to -91 and add up 90, you know that the following is true:

x² + 90x - 91 = (x - 1 ) (x + 91)

Multiply To One Number and Add Up To Another
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