What two numbers multiply to 84 and add up to 25?

Here we answer the question: "What two numbers multiply to 84 and add up to 25?"

The answer to your question is:

4 and 21

Below we illustrate and prove that 4 and 21 multiply to 84 and add up to 25:

4 × 21 = 84
4 + 21 = 25

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

x² + 25x + 84 = 0

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

(x + 4 ) (x + 21)

To summarize, since 4 and 21 multiply to 84 and add up 25, you know that the following is true:

x² + 25x + 84 = (x + 4 ) (x + 21)

Multiply To One Number and Add Up To Another
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