What two numbers multiply to -490 and add up to 489?

Here we answer the question: "What two numbers multiply to -490 and add up to 489?"

The answer to your question is:

-1 and 490

Below we illustrate and prove that -1 and 490 multiply to -490 and add up to 489:

-1 × 490 = -490
-1 + 490 = 489

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

x² + 489x - 490 = 0

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

(x - 1 ) (x + 490)

To summarize, since -1 and 490 multiply to -490 and add up 489, you know that the following is true:

x² + 489x - 490 = (x - 1 ) (x + 490)

Multiply To One Number and Add Up To Another
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