What two numbers multiply to -648 and add up to 647?

Here we answer the question: "What two numbers multiply to -648 and add up to 647?"

The answer to your question is:

-1 and 648

Below we illustrate and prove that -1 and 648 multiply to -648 and add up to 647:

-1 × 648 = -648
-1 + 648 = 647

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

x² + 647x - 648 = 0

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

(x - 1 ) (x + 648)

To summarize, since -1 and 648 multiply to -648 and add up 647, you know that the following is true:

x² + 647x - 648 = (x - 1 ) (x + 648)

Multiply To One Number and Add Up To Another
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