What two numbers multiply to -20 and add up to -1?

Here we answer the question: "What two numbers multiply to -20 and add up to -1?"

The answer to your question is:

-5 and 4

Below we illustrate and prove that -5 and 4 multiply to -20 and add up to -1:

-5 × 4 = -20
-5 + 4 = -1

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

x² - 1x - 20 = 0

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

(x - 5 ) (x + 4)

To summarize, since -5 and 4 multiply to -20 and add up -1, you know that the following is true:

x² - 1x - 20 = (x - 5 ) (x + 4)

Multiply To One Number and Add Up To Another
Did you find the information on this page useful? Here you can solve a similar problem.