Question

Bantuan volume integral ya :)

Answer 1

Y= 8- 2x
y^2 = (8-2x)^2
V= π int y^2 dx
   = π int (8-2x)^2
   = π. -1/6 (8-2x)^3

Karena d batasi x =1 dan x=3
   = π .[ {-1/6(8-2(3))^3} - {-1/6 (8-2(1))^3}
  =π [-8/6 -  (-36)]
 = 34 2/3 π sat volume