Find the inverse of the following matrices by writing them in the form I - D and using the sum-of-powers method on D. Check the accuracy of your answer by using the determinant-based formula for the inverse of ~ 2-b)1-2 matrix (see Section 3 .3) . (a) .7 - .2 - .4 .8 (b) . 6 .3 .2 .5 (c) .6 0 0 .5