What two numbers multiply to 642 and add up to 643?

Here we answer the question: "What two numbers multiply to 642 and add up to 643?"

The answer to your question is:

1 and 642

Below we illustrate and prove that 1 and 642 multiply to 642 and add up to 643:

1 × 642 = 642
1 + 642 = 643

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

x² + 643x + 642 = 0

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

(x + 1 ) (x + 642)

To summarize, since 1 and 642 multiply to 642 and add up 643, you know that the following is true:

x² + 643x + 642 = (x + 1 ) (x + 642)

Multiply To One Number and Add Up To Another
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