What two numbers multiply to 800 and add up to -90?

Here we answer the question: "What two numbers multiply to 800 and add up to -90?"

The answer to your question is:

-80 and -10

Below we illustrate and prove that -80 and -10 multiply to 800 and add up to -90:

-80 × -10 = 800
-80 + -10 = -90

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

x² - 90x + 800 = 0

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

(x - 80 ) (x - 10)

To summarize, since -80 and -10 multiply to 800 and add up -90, you know that the following is true:

x² - 90x + 800 = (x - 80 ) (x - 10)

Multiply To One Number and Add Up To Another
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