What two numbers multiply to -855 and add up to 42?

Here we answer the question: "What two numbers multiply to -855 and add up to 42?"

The answer to your question is:

-15 and 57

Below we illustrate and prove that -15 and 57 multiply to -855 and add up to 42:

-15 × 57 = -855
-15 + 57 = 42

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

x² + 42x - 855 = 0

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

(x - 15 ) (x + 57)

To summarize, since -15 and 57 multiply to -855 and add up 42, you know that the following is true:

x² + 42x - 855 = (x - 15 ) (x + 57)

Multiply To One Number and Add Up To Another
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