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

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

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 -91:

-90 × -1 = 90
-90 + -1 = -91

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

x² - 91x + 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 -91, you know that the following is true:

x² - 91x + 90 = (x - 90 ) (x - 1)

Multiply To One Number and Add Up To Another
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