What two numbers multiply to 128 and add up to 129?

Here we answer the question: "What two numbers multiply to 128 and add up to 129?"

The answer to your question is:

1 and 128

Below we illustrate and prove that 1 and 128 multiply to 128 and add up to 129:

1 × 128 = 128
1 + 128 = 129

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

x² + 129x + 128 = 0

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

(x + 1 ) (x + 128)

To summarize, since 1 and 128 multiply to 128 and add up 129, you know that the following is true:

x² + 129x + 128 = (x + 1 ) (x + 128)

Multiply To One Number and Add Up To Another
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