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X squared minus 20x what value should be added to the equation to create a perfect square
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X squared minus 20x what value should be added to the equation to create a perfect square

User Martin Fido
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x^2 - 20x + (20/2)^2 - (20/2)^2, or

x^2 - 20x + 400/4 - 400/4, or x^2 - 20x + 100 - 100 (answer)
User Bob Vork
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