What two numbers multiply to -645 and add up to 644?

Here we answer the question: "What two numbers multiply to -645 and add up to 644?"

The answer to your question is:

-1 and 645

Below we illustrate and prove that -1 and 645 multiply to -645 and add up to 644:

-1 × 645 = -645
-1 + 645 = 644

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

x² + 644x - 645 = 0

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

(x - 1 ) (x + 645)

To summarize, since -1 and 645 multiply to -645 and add up 644, you know that the following is true:

x² + 644x - 645 = (x - 1 ) (x + 645)

Multiply To One Number and Add Up To Another
Did you find the information on this page useful? Here you can solve a similar problem.