What two numbers multiply to 16 and add up to -8?

Here we answer the question: "What two numbers multiply to 16 and add up to -8?"

The answer to your question is:

-4 and -4

Below we illustrate and prove that -4 and -4 multiply to 16 and add up to -8:

-4 × -4 = 16
-4 + -4 = -8

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

x² - 8x + 16 = 0

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

(x - 4 ) (x - 4)

To summarize, since -4 and -4 multiply to 16 and add up -8, you know that the following is true:

x² - 8x + 16 = (x - 4 ) (x - 4)

Multiply To One Number and Add Up To Another
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