What two numbers multiply to -85 and add up to 84?

Here we answer the question: "What two numbers multiply to -85 and add up to 84?"

The answer to your question is:

-1 and 85

Below we illustrate and prove that -1 and 85 multiply to -85 and add up to 84:

-1 × 85 = -85
-1 + 85 = 84

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

x² + 84x - 85 = 0

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

(x - 1 ) (x + 85)

To summarize, since -1 and 85 multiply to -85 and add up 84, you know that the following is true:

x² + 84x - 85 = (x - 1 ) (x + 85)

Multiply To One Number and Add Up To Another
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