What two numbers multiply to -216 and add up to 215?

Here we answer the question: "What two numbers multiply to -216 and add up to 215?"

The answer to your question is:

-1 and 216

Below we illustrate and prove that -1 and 216 multiply to -216 and add up to 215:

-1 × 216 = -216
-1 + 216 = 215

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

x² + 215x - 216 = 0

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

(x - 1 ) (x + 216)

To summarize, since -1 and 216 multiply to -216 and add up 215, you know that the following is true:

x² + 215x - 216 = (x - 1 ) (x + 216)

Multiply To One Number and Add Up To Another
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