SOLUTION: Identify the number that needs tobe added to both sides of the equation x^2 - 4x = 21 to complete the square.

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Question 321797: Identify the number that needs tobe added to both sides of the equation x^2 - 4x = 21 to complete the square.

Answer by Alan3354(69443) About Me  (Show Source):
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Identify the number that needs tobe added to both sides of the equation x^2 - 4x = 21 to complete the square.
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c+=+%28b%2F2a%29%5E2+=+%284%2F2%29%5E2+=+4
Add 4.