In Exercises 1928, find A -1 by forming [A| I ] and then using row operations to
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In Exercises 19–28, find A-1 by forming [A| I] and then using row operations to obtain [I| B], where A-1 = [B]. Check that AA-1 = I and A-1 A = I.
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A || 2 0 0 1 00 0 0 01 0 0 0 2 -1 0
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