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Differential Equations is a difficult subject for most students because each type of equation has many solution methods that the student must understand how to perform. In addition, each solution method usually is very involved with many different steps that require the student to have a solid foundation in Calculus.
Solving higher order differential equations is challenging for most students simply because the solution methods usually run several pages in length even for the easier problems. The student must identify the type of equation to solve and apply the appropriate solution method, which can lead to valuable lost time on an exam if the wrong solution method is chosen at the outset.
Matrix Algebra usually gives students problems in the beginning because although it has applications in algebra, it looks completely different from any algebra the student has used up to this point. The material on these DVDs is covered in most advanced high school algebra courses and is definitely covered in a university linear algebra course.