What two numbers multiply to -646 and add up to 645?

Here we answer the question: "What two numbers multiply to -646 and add up to 645?"

The answer to your question is:

-1 and 646

Below we illustrate and prove that -1 and 646 multiply to -646 and add up to 645:

-1 × 646 = -646
-1 + 646 = 645

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

x² + 645x - 646 = 0

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

(x - 1 ) (x + 646)

To summarize, since -1 and 646 multiply to -646 and add up 645, you know that the following is true:

x² + 645x - 646 = (x - 1 ) (x + 646)

Multiply To One Number and Add Up To Another
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