What two numbers multiply to -396 and add up to -21?

Here we answer the question: "What two numbers multiply to -396 and add up to -21?"

The answer to your question is:

-33 and 12

Below we illustrate and prove that -33 and 12 multiply to -396 and add up to -21:

-33 × 12 = -396
-33 + 12 = -21

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

x² - 21x - 396 = 0

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

(x - 33 ) (x + 12)

To summarize, since -33 and 12 multiply to -396 and add up -21, you know that the following is true:

x² - 21x - 396 = (x - 33 ) (x + 12)

Multiply To One Number and Add Up To Another
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