Here we answer the question: "What two numbers multiply to -684 and add up to 45?"
The answer to your question is:
-12 and 57
Below we illustrate and prove that -12 and 57 multiply to -684 and add up to 45:
-12 × 57 = -684
-12 + 57 = 45
Are you asking because you are trying to figure out how to factor the following quadratic equation?
x2 + 45x - 684 = 0
If so, the solution to factor the quadratic equation above is:
(x - 12 ) (x + 57)
To summarize, since -12 and 57 multiply to -684 and add up 45, you know that the following is true:
x2 + 45x - 684 = (x - 12 ) (x + 57)
Multiply To One Number and Add Up To Another
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