Page 153 - Elementary_Linear_Algebra_with_Applications_Anton__9_edition
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(b)
Prove the following special cases of Theorem 2.2.3.
15.
(a)
(b)
Repeat Exercises 4–7 using a combination of row reduction and cofactor expansion, as in Example 6.
16.
Repeat Exercises 8–11 using a combination of row reduction and cofactor expansion, as in Example 6.
17.
In each part, find by inspection, and explain your reasoning.
18.
(a)
(b)
By inspection, solve the equation
19.
Explain your reasoning.
20.
(a) By inspection, find two solutions of the equation
