4. Let 1. (3 Points) Find A-¹ by using the formula A = a11 a21 2. Row-reduce a12 a22] ⇒ A - A=43 A: 1 a11a22 a12a21 a22 3. (1 Point) Find A-¹-a21-a12 a11 [4=[39] [AT] = -1 Perform the following operation on [AI] -> . (2 Points) Keep R₁ and substitute R2 R2 + R₁ . (2 Points) Keep R2 and substitute R₁ → 2R₁ - R₂ with a11022-a12a21 0 • (2 Points) substitute R₁ R₁, and substitute R₂ R2, Pleasc go on to the next
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The formula for the inverse of a 2x2 matrix A is A⁻¹ = 1/det(A) * [a22 -a21; -a12 a11], where det(A) is the determinant of A. Show more…
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