If A = [20]. a b then A is invertible if ad - bc 0, in...

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If A = [20]. a b then A is invertible if ad - bc 0, in which case A-1 = 1 d-b ad - bc a If ad bc = 0, then A is not invertible. Find the inverse of the given matrix (if it exists) using the theorem above. -1.5 -4.2 0.5 2.4 If A = [20]. a b then A is invertible if ad - bc 0, in which case A-1 = 1 d-b ad - bc a If ad bc = 0, then A is not invertible. Find the inverse of the given matrix (if it exists) using the theorem above. -1.5 -4.2 0.5 2.4