Solution: Exercises 25 and 26 prove Theorem 4 for Show that
Chapter 2, Problem 25E(choose chapter or problem)
Exercises 25 and 26 prove Theorem 4 for Show that if ad – bc = 0, then the equation Ax = 0 has more than one solution. Why does this imply that A is not invertible? [Hint: First, consider a = b = 0: Then, if a and b are not both zero, consider the vector
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