What two numbers multiply to 4 and add up to -5?

Here we answer the question: "What two numbers multiply to 4 and add up to -5?"

The answer to your question is:

-4 and -1

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

-4 × -1 = 4
-4 + -1 = -5

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

x² - 5x + 4 = 0

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

(x - 4 ) (x - 1)

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

x² - 5x + 4 = (x - 4 ) (x - 1)

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.