Here we answer the question: "What two numbers multiply to -642 and add up to -641?"
The answer to your question is:
-642 and 1
Below we illustrate and prove that -642 and 1 multiply to -642 and add up to -641:
-642 × 1 = -642
-642 + 1 = -641
Are you asking because you are trying to figure out how to factor the following quadratic equation?
x2 - 641x - 642 = 0
If so, the solution to factor the quadratic equation above is:
(x - 642 ) (x + 1)
To summarize, since -642 and 1 multiply to -642 and add up -641, you know that the following is true:
x2 - 641x - 642 = (x - 642 ) (x + 1)
Multiply To One Number and Add Up To Another
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