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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