This full solution covers the following key subjects: . This expansive textbook survival guide covers 47 chapters, and 921 solutions. Linear Algebra with Applications was written by and is associated to the ISBN: 9780136009290. This textbook survival guide was created for the textbook: Linear Algebra with Applications, edition: 8. The full step-by-step solution to problem: 19 from chapter: 1.5 was answered by , our top Math solution expert on 03/15/18, 05:24PM. Since the solution to 19 from 1.5 chapter was answered, more than 210 students have viewed the full step-by-step answer. The answer to “Let U be an n n upper triangular matrix with nonzero diagonal entries. (a) Explain why U must be nonsingular. (b) Explain why U1 must be upper triangular. 2” is broken down into a number of easy to follow steps, and 29 words.