Algebra 2 - Learn how to simplify a radical with imaginary numbers, 3sqrt(-128)

The video tutorial explains how to simplify a mathematical expression involving square roots and imaginary numbers. It begins by setting up the problem and identifying the largest square number that divides into 128. The instructor then demonstrates how to simplify the expression by separating the square roots and explains the correct notation for imaginary numbers, emphasizing the importance of placing 'i' in front of the square root to avoid common mistakes.

Describe the process of simplifying sqrt(128) using square numbers.

What is the significance of writing 'i' in front of the square root in complex numbers?