Here we answer the question: "What two numbers multiply to -405 and add up to -12?"
The answer to your question is:
-27 and 15
Below we illustrate and prove that -27 and 15 multiply to -405 and add up to -12:
-27 × 15 = -405
-27 + 15 = -12
Are you asking because you are trying to figure out how to factor the following quadratic equation?
x2 - 12x - 405 = 0
If so, the solution to factor the quadratic equation above is:
(x - 27 ) (x + 15)
To summarize, since -27 and 15 multiply to -405 and add up -12, you know that the following is true:
x2 - 12x - 405 = (x - 27 ) (x + 15)
Multiply To One Number and Add Up To Another
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