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:

-129 and 5

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

-129 × 5 = -645
-129 + 5 = -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 - 129 ) (x + 5)

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

x² - 124x - 645 = (x - 129 ) (x + 5)

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.