What two numbers multiply to -400 and add up to -42?




Here we answer the question: "What two numbers multiply to -400 and add up to -42?"

The answer to your question is:

-50 and 8


Below we illustrate and prove that -50 and 8 multiply to -400 and add up to -42:

-50 × 8 = -400
-50 + 8 = -42

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

x2 - 42x - 400 = 0

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

(x - 50 ) (x + 8)

To summarize, since -50 and 8 multiply to -400 and add up -42, you know that the following is true:

x2 - 42x - 400 = (x - 50 ) (x + 8)


Multiply To One Number and Add Up To Another
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