SOLUTION: The difference of the square of a number and 21 is equal to 4 times that number. Find the negative solution

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Question 1078938: The difference of the square of a number and 21 is equal to 4 times that number. Find the negative solution
Answer by Alan3354(69443) About Me  (Show Source):
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The difference of the square of a number and 21 is equal to 4 times that number. Find the negative solution
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n is "the number"
The difference of n^2 and 21 is either
n^2 - 21, or
21 - n^2
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n^2 - 21 = 4n
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Or,
21 - n^2 = 4n
Solve for n.