Question 31315
1. xyz=(-1/a)(4/(1+a)^2)
     V=(-4)/(a(1+a)^2)
2. -v/4 = 1/(a(1+a)^2) because multiply with negative (-1/4) on both sides.
3. then, (a(1+a)^2) is (-4/v) it's the reciprocal.