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:

1 and 15

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

1 × 15 = 15
1 + 15 = 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 + 1 ) (x + 15)

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

x² + 16x + 15 = (x + 1 ) (x + 15)

Multiply To One Number and Add Up To Another
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