Question

Tolong jawab pakai caranya ya
:)

Answer 1

V1 = V2
π int (1 sampai k) (1/x)^2 dx = π int (k sampai 4) (1/x)^2 dx
int (1 sampai k) (x^-2) dx = int (k sampai 4) (x^-2) dx
1/(-1) x^(-1) (batas 1 sampai k) = 1/(-1) x^-1 (batas k sampai 4)
-1/x (batas 1 sampai k) = -1/x (batas k sampai 4)
-1/1 - (-1/k) = -1/k - (-1/4)
-1 + 1/k = -1/k + 1/4
2/k = 5/4
5k = 8
k = 8/5