What two numbers multiply to -900 and add up to 80?

Here we answer the question: "What two numbers multiply to -900 and add up to 80?"

The answer to your question is:

-10 and 90

Below we illustrate and prove that -10 and 90 multiply to -900 and add up to 80:

-10 × 90 = -900
-10 + 90 = 80

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

x² + 80x - 900 = 0

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

(x - 10 ) (x + 90)

To summarize, since -10 and 90 multiply to -900 and add up 80, you know that the following is true:

x² + 80x - 900 = (x - 10 ) (x + 90)

Multiply To One Number and Add Up To Another
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