1. The problem statement, all variables and given/known data Question: The strain state in a point is defined by the tensor: 0.9 0 0 0 -0.4 0.2 0 0.2 0.6 - Define principal strains and directions in the point - Explain how deforms the element shown in figure 2b (they just drew a cube on 3d axis) - Draw the principal directions 2. Relevant equations So i know that ε^3 - I1ε^2 - I2ε - I3 = 0 3. The attempt at a solution and for the I values, i subbed the tensor values in and got I1 = 0.7, I2 = 0.02, I3 = -0.252 I have a feeling i'm subbing the wrong values though. is εx = εxx from the tensor above? Becuase the end equation i get, does not give me any roots.