math265_F09_mid1_practice

# math265_F09_mid1_practice - Math 265 Practice Midterm 1...

This preview shows pages 1–4. Sign up to view the full content.

Math 265, Practice Midterm 1 Sept 27, 2009 Name: This exam consists of 8 pages including this front page. Ground Rules 1. No calculator is allowed. 2. Show your work for every problem unless otherwise stated. 3. You may use one 4-by-6 index card, both sides. Score 1 15 2 15 3 10 4 15 5 15 6 15 7 15 Total 100 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
1. The following are true/false questions. You don’t have to justify your an- swers. Just write down either T or F in the table below. A, B, C, X, b are always matrices here. (a) If A 2 makes sense then A is a square matrix. (b) A system of linear equations can not have exactly 2 solutions. (c) If AB = AC and A 6 = 0 then B = C . (d) Let W be a subspace of a vector space V . If v W then - v W . (e) det(2 A ) = 2 det( A ) . (a) (b) (c) (d) (e) Answer T T F T F 2
2. Quick Questions, A, B, C, X, b are always matrices here: (a) Suppose that det( A ) = det( A - 1 ). det( A ) =? Solution: det( A ) = det( A - 1 ) = (det( A )) - 1 . So det( A ) 2 = 1 and then det( A ) = ± 1. (b) Suppose

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 8

math265_F09_mid1_practice - Math 265 Practice Midterm 1...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online