What two numbers multiply to -16 and add up to 0?

Here we answer the question: "What two numbers multiply to -16 and add up to 0?"

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 0:

-4 × 4 = -16
-4 + 4 = 0

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

x² + 0x - 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 0, you know that the following is true:

x² + 0x - 16 = (x - 4 ) (x + 4)

Multiply To One Number and Add Up To Another
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