Question 123983
D(D-1)+4D=D(D-8)
D^2-D+4D=D^2-8D
CANCEL OUT THE D^2 TERMS
3D+8D=0
11D=0
D=0 ANSWER.
PROOF:
0(0+1)+4*0=0(0-8)
0*1+0=0*-8
0+0=0
0=0