What two numbers multiply to 80 and add up to 18?

Here we answer the question: "What two numbers multiply to 80 and add up to 18?"

The answer to your question is:

8 and 10

Below we illustrate and prove that 8 and 10 multiply to 80 and add up to 18:

8 × 10 = 80
8 + 10 = 18

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

x² + 18x + 80 = 0

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

(x + 8 ) (x + 10)

To summarize, since 8 and 10 multiply to 80 and add up 18, you know that the following is true:

x² + 18x + 80 = (x + 8 ) (x + 10)

Multiply To One Number and Add Up To Another
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