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100. Here's how: A perfect square is in the form [(a+b)² =a² + 2ab + b²]. So let a =x, then 2ab = 20x, solve for b=10, so it is x² + 20x +10² = x² + 20x + 100, or (x+10)².

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Q: What value should be added to the expression to create a perfect square x2 20x?
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