What two numbers multiply to -128 and add up to 8?




Here we answer the question: "What two numbers multiply to -128 and add up to 8?"

The answer to your question is:

-8 and 16


Below we illustrate and prove that -8 and 16 multiply to -128 and add up to 8:

-8 × 16 = -128
-8 + 16 = 8

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

x2 + 8x - 128 = 0

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

(x - 8 ) (x + 16)

To summarize, since -8 and 16 multiply to -128 and add up 8, you know that the following is true:

x2 + 8x - 128 = (x - 8 ) (x + 16)


Multiply To One Number and Add Up To Another
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