pratice problem don't understand some steps

Assume a,b,c,d,e,f, g, and h are non-zero real numbers. Determine the inverse matrix of the matrix fa 0 b 07 0 c 0 d e 0 f 0 _0 g 0 h_ using the procedure demonstrated in the handout Classroom Examples Week 3. Show the algebraic process to determine the inverse (you may not use the determinant or any other "shortcuts\"). The correct inverse is worth 5 points. The correct procedure is worth 20 points. Make sure to identify any conditions that must occur in order that the inverse does exist. (Fo example, in the 2x2 matrix [ points. a b the condition is ad bc :2 0 ). The correct conditions are worth 5 c LetA and B be 2x2 matrices. Prove that A(B + C) : AB+AC. Hint: Use letters. Worth 30 points