Tutorial - Combining complex numbers ex 3, (-2i - 6i) - (4 - 6i)

The video tutorial addresses common mistakes students make when adding and subtracting complex numbers. It emphasizes the importance of combining like terms and correctly applying signs. The instructor demonstrates converting subtraction into an addition problem by changing the sign of the subtracted term and using the vertical method for calculation. The tutorial concludes with a final example, showing the correct subtraction of two complex numbers.

What common mistakes do students make when subtracting complex numbers, according to the speaker?

How does the speaker arrive at the final answer of -6 when subtracting the complex numbers?