known T :R^3 -> R^3 is linear operator defined by
T(x₁, x2, x3) = (3x₁ + x2, −2x₁ − 4x2 + 3x3, 5x₁ + 4x₂ − 2x3)
find whether T is one to one, if so find T-1(u1,u2,u3)