What two numbers multiply to -648 and add up to 213?

Here we answer the question: "What two numbers multiply to -648 and add up to 213?"

The answer to your question is:

-3 and 216

Below we illustrate and prove that -3 and 216 multiply to -648 and add up to 213:

-3 × 216 = -648
-3 + 216 = 213

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

x² + 213x - 648 = 0

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

(x - 3 ) (x + 216)

To summarize, since -3 and 216 multiply to -648 and add up 213, you know that the following is true:

x² + 213x - 648 = (x - 3 ) (x + 216)

Multiply To One Number and Add Up To Another
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