Here we answer the question: "What two numbers multiply to -520 and add up to -258?"
The answer to your question is:
-260 and 2
Below we illustrate and prove that -260 and 2 multiply to -520 and add up to -258:
-260 × 2 = -520
-260 + 2 = -258
Are you asking because you are trying to figure out how to factor the following quadratic equation?
x2 - 258x - 520 = 0
If so, the solution to factor the quadratic equation above is:
(x - 260 ) (x + 2)
To summarize, since -260 and 2 multiply to -520 and add up -258, you know that the following is true:
x2 - 258x - 520 = (x - 260 ) (x + 2)
Multiply To One Number and Add Up To Another
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