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malcolmfernandes10
The answer is 20x^18 which is the last option.
We need to factor √(400x^36)
√(400x^36) = √400 √x^36

√400 = 20
√x^36 = x^18

So √400 * √(x^36) = 20(x^18) (Answer d)

Hope this helps! :)

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good job