What two numbers multiply to 54 and add up to 21?

Here we answer the question: "What two numbers multiply to 54 and add up to 21?"

The answer to your question is:

3 and 18

Below we illustrate and prove that 3 and 18 multiply to 54 and add up to 21:

3 × 18 = 54
3 + 18 = 21

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

x² + 21x + 54 = 0

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

(x + 3 ) (x + 18)

To summarize, since 3 and 18 multiply to 54 and add up 21, you know that the following is true:

x² + 21x + 54 = (x + 3 ) (x + 18)

Multiply To One Number and Add Up To Another
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