What two numbers multiply to 639 and add up to 80?




Here we answer the question: "What two numbers multiply to 639 and add up to 80?"

The answer to your question is:

9 and 71


Below we illustrate and prove that 9 and 71 multiply to 639 and add up to 80:

9 × 71 = 639
9 + 71 = 80

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

x2 + 80x + 639 = 0

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

(x + 9 ) (x + 71)

To summarize, since 9 and 71 multiply to 639 and add up 80, you know that the following is true:

x2 + 80x + 639 = (x + 9 ) (x + 71)


Multiply To One Number and Add Up To Another
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