In the picture below, D is the midpoint of AB, CE/DE = 5/3, BF/EF = 1/3. If the ABC triangle's area is 192u², what's the BDF triangle's area?

To diagonalize an nxn matrix a means to find an invertible matrix p and a diagonal matrix d such that a pdp d p ap or [1 3 dh epap 3 let a=-3 -5 -3 3 3 1 step 1: find the eigenvalues of matrix a "2's" step 2: find the corresponding eigenvectors of a step 3: createp from eigenvectors in step 2 step 4 create d with matching eigenvalues.