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

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

The answer to your question is:

-1 and 5

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

-1 × 5 = -5
-1 + 5 = 4

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

x² + 4x - 5 = 0

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

(x - 1 ) (x + 5)

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

x² + 4x - 5 = (x - 1 ) (x + 5)

Multiply To One Number and Add Up To Another
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