[25 pte} Count exactly the number of multiplicatienefdieiona needed to perform forward aubetitutiun nn y 2 h, where G is a nnneingular lx l lewer...

Please help solve this question. If G is a lower triangle, how come for i<j, G(i,j) is 0?

3. [25 pte} Count exactly the number of multiplicatienefdifieiona needed to performforward aubetitutiun nn fly 2 h, where G is a nnneingular lflflx lflfl lewer triangularhanded matrix with aemihand width 9: EH 2 D for t&quot; -:1' j and ya = CI for 2; 2:- j +9. You must eifieienltl}.r nae the banded structure and there is nu need to enuntadditionafeubtraetiena. Remember forward Substitution: f—lHi = (5i ' Eflijyj) /yfi-i=1