What two numbers multiply to -21 and add up to -20?




Here we answer the question: "What two numbers multiply to -21 and add up to -20?"

The answer to your question is:

-21 and 1


Below we illustrate and prove that -21 and 1 multiply to -21 and add up to -20:

-21 × 1 = -21
-21 + 1 = -20

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

x2 - 20x - 21 = 0

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

(x - 21 ) (x + 1)

To summarize, since -21 and 1 multiply to -21 and add up -20, you know that the following is true:

x2 - 20x - 21 = (x - 21 ) (x + 1)


Multiply To One Number and Add Up To Another
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