What two numbers multiply to 399 and add up to 64?

Here we answer the question: "What two numbers multiply to 399 and add up to 64?"

The answer to your question is:

7 and 57

Below we illustrate and prove that 7 and 57 multiply to 399 and add up to 64:

7 × 57 = 399
7 + 57 = 64

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

x² + 64x + 399 = 0

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

(x + 7 ) (x + 57)

To summarize, since 7 and 57 multiply to 399 and add up 64, you know that the following is true:

x² + 64x + 399 = (x + 7 ) (x + 57)

Multiply To One Number and Add Up To Another
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