18. In each part, let T₁: R3-R² be multiplication by A, and let u,= (0, 1, 1) and u₂=(2,-1, 1) and u3 = (1, 1, -2). Determine whether the set {TA(u), TA(u₂), T₁(₂)) spans R². -619 -61 a. A = b. A=

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