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

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

The answer to your question is:

-2 and -2

Below we illustrate and prove that -2 and -2 multiply to 4 and add up to -4:

-2 × -2 = 4
-2 + -2 = -4

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

x² - 4x + 4 = 0

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

(x - 2 ) (x - 2)

To summarize, since -2 and -2 multiply to 4 and add up -4, you know that the following is true:

x² - 4x + 4 = (x - 2 ) (x - 2)

Multiply To One Number and Add Up To Another
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