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:

10 and 80

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

10 × 80 = 800
10 + 80 = 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 + 10 ) (x + 80)

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

x² + 90x + 800 = (x + 10 ) (x + 80)

Multiply To One Number and Add Up To Another
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