What two numbers multiply to -678 and add up to 677?

Here we answer the question: "What two numbers multiply to -678 and add up to 677?"

The answer to your question is:

-1 and 678

Below we illustrate and prove that -1 and 678 multiply to -678 and add up to 677:

-1 × 678 = -678
-1 + 678 = 677

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

x² + 677x - 678 = 0

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

(x - 1 ) (x + 678)

To summarize, since -1 and 678 multiply to -678 and add up 677, you know that the following is true:

x² + 677x - 678 = (x - 1 ) (x + 678)

Multiply To One Number and Add Up To Another
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