What two numbers multiply to -690 and add up to 689?

Here we answer the question: "What two numbers multiply to -690 and add up to 689?"

The answer to your question is:

-1 and 690

Below we illustrate and prove that -1 and 690 multiply to -690 and add up to 689:

-1 × 690 = -690
-1 + 690 = 689

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

x² + 689x - 690 = 0

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

(x - 1 ) (x + 690)

To summarize, since -1 and 690 multiply to -690 and add up 689, you know that the following is true:

x² + 689x - 690 = (x - 1 ) (x + 690)

Multiply To One Number and Add Up To Another
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