What is the simplified form of square root of 144 x to the 36th power ?

The square root of 144 is 12. Since x to the 36th power is (x to the 18th power) squared, its square root is |x to the 18th power|, which equals x to the 18th power for real x. So the simplified form is 12x to the 18th power, choice C.

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