Here we answer the question: "What two numbers multiply to -128 and add up to 28?"
The answer to your question is:
-4 and 32
Below we illustrate and prove that -4 and 32 multiply to -128 and add up to 28:
-4 × 32 = -128
-4 + 32 = 28
Are you asking because you are trying to figure out how to factor the following quadratic equation?
x2 + 28x - 128 = 0
If so, the solution to factor the quadratic equation above is:
(x - 4 ) (x + 32)
To summarize, since -4 and 32 multiply to -128 and add up 28, you know that the following is true:
x2 + 28x - 128 = (x - 4 ) (x + 32)
Multiply To One Number and Add Up To Another
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