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

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

The answer to your question is:

-15 and -1

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

-15 × -1 = 15
-15 + -1 = -16

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

x² - 16x + 15 = 0

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

(x - 15 ) (x - 1)

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

x² - 16x + 15 = (x - 15 ) (x - 1)

Multiply To One Number and Add Up To Another
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