What two numbers multiply to 80 and add up to 81?




Here we answer the question: "What two numbers multiply to 80 and add up to 81?"

The answer to your question is:

1 and 80


Below we illustrate and prove that 1 and 80 multiply to 80 and add up to 81:

1 × 80 = 80
1 + 80 = 81

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

x2 + 81x + 80 = 0

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

(x + 1 ) (x + 80)

To summarize, since 1 and 80 multiply to 80 and add up 81, you know that the following is true:

x2 + 81x + 80 = (x + 1 ) (x + 80)


Multiply To One Number and Add Up To Another
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