What two numbers multiply to -990 and add up to 51?

Here we answer the question: "What two numbers multiply to -990 and add up to 51?"

The answer to your question is:

-15 and 66

Below we illustrate and prove that -15 and 66 multiply to -990 and add up to 51:

-15 × 66 = -990
-15 + 66 = 51

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

x² + 51x - 990 = 0

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

(x - 15 ) (x + 66)

To summarize, since -15 and 66 multiply to -990 and add up 51, you know that the following is true:

x² + 51x - 990 = (x - 15 ) (x + 66)

Multiply To One Number and Add Up To Another
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