What two numbers multiply to -8 and add up to 7?

Here we answer the question: "What two numbers multiply to -8 and add up to 7?"

The answer to your question is:

-1 and 8

Below we illustrate and prove that -1 and 8 multiply to -8 and add up to 7:

-1 × 8 = -8
-1 + 8 = 7

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

x² + 7x - 8 = 0

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

(x - 1 ) (x + 8)

To summarize, since -1 and 8 multiply to -8 and add up 7, you know that the following is true:

x² + 7x - 8 = (x - 1 ) (x + 8)

Multiply To One Number and Add Up To Another
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