What two numbers multiply to -647 and add up to 646?

Here we answer the question: "What two numbers multiply to -647 and add up to 646?"

The answer to your question is:

-1 and 647

Below we illustrate and prove that -1 and 647 multiply to -647 and add up to 646:

-1 × 647 = -647
-1 + 647 = 646

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

x² + 646x - 647 = 0

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

(x - 1 ) (x + 647)

To summarize, since -1 and 647 multiply to -647 and add up 646, you know that the following is true:

x² + 646x - 647 = (x - 1 ) (x + 647)

Multiply To One Number and Add Up To Another
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