In Exercises 1318, use the fact that if 1 ad - bc A then 1 = [a
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In Exercises 13–18, use the fact that if
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1 ad - bc A then 1 = [a b], th -b] 10 to find the inverse of each matrix, if d -b a A-¹ possible. Check that AA¹ = 1₂ and A¹A = 1₂. bc-c
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