What two numbers multiply to 20 and add up to 9?

Here we answer the question: "What two numbers multiply to 20 and add up to 9?"

The answer to your question is:

4 and 5

Below we illustrate and prove that 4 and 5 multiply to 20 and add up to 9:

4 × 5 = 20
4 + 5 = 9

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

x² + 9x + 20 = 0

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

(x + 4 ) (x + 5)

To summarize, since 4 and 5 multiply to 20 and add up 9, you know that the following is true:

x² + 9x + 20 = (x + 4 ) (x + 5)

Multiply To One Number and Add Up To Another
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