What two numbers multiply to -16 and add up to -15?

Here we answer the question: "What two numbers multiply to -16 and add up to -15?"

The answer to your question is:

-16 and 1

Below we illustrate and prove that -16 and 1 multiply to -16 and add up to -15:

-16 × 1 = -16
-16 + 1 = -15

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

x² - 15x - 16 = 0

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

(x - 16 ) (x + 1)

To summarize, since -16 and 1 multiply to -16 and add up -15, you know that the following is true:

x² - 15x - 16 = (x - 16 ) (x + 1)

Multiply To One Number and Add Up To Another
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