Here we answer the question: "What two numbers multiply to 648 and add up to -166?"
The answer to your question is:
-162 and -4
Below we illustrate and prove that -162 and -4 multiply to 648 and add up to -166:
-162 × -4 = 648
-162 + -4 = -166
Are you asking because you are trying to figure out how to factor the following quadratic equation?
x2 - 166x + 648 = 0
If so, the solution to factor the quadratic equation above is:
(x - 162 ) (x - 4)
To summarize, since -162 and -4 multiply to 648 and add up -166, you know that the following is true:
x2 - 166x + 648 = (x - 162 ) (x - 4)
Multiply To One Number and Add Up To Another
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