What two numbers multiply to -645 and add up to -28?

Here we answer the question: "What two numbers multiply to -645 and add up to -28?"

The answer to your question is:

-43 and 15

Below we illustrate and prove that -43 and 15 multiply to -645 and add up to -28:

-43 × 15 = -645
-43 + 15 = -28

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

x² - 28x - 645 = 0

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

(x - 43 ) (x + 15)

To summarize, since -43 and 15 multiply to -645 and add up -28, you know that the following is true:

x² - 28x - 645 = (x - 43 ) (x + 15)

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.