Simplify.

4i (imaginary number)

By the way.. I mean radical form....

Sorry for the confusion but I meant square root of 4i

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To simplify the expression 4i, we need to understand the properties of imaginary numbers. An imaginary number is defined as the product of a real number and the imaginary unit "i," where i is defined as the square root of -1.

In this case, we have 4 times i. Since i cannot be further simplified, we keep the "i" term as it is. Therefore, the simplified form of 4i is just 4i.