What two numbers multiply to -645 and add up to 124?

Here we answer the question: "What two numbers multiply to -645 and add up to 124?"

The answer to your question is:

-5 and 129

Below we illustrate and prove that -5 and 129 multiply to -645 and add up to 124:

-5 × 129 = -645
-5 + 129 = 124

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

x² + 124x - 645 = 0

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

(x - 5 ) (x + 129)

To summarize, since -5 and 129 multiply to -645 and add up 124, you know that the following is true:

x² + 124x - 645 = (x - 5 ) (x + 129)

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.