tentukan nilai a jika integral batas atas a dan batas bawah 0 (akar X) dx=18

Int x^(1/2) dx [a_0] = 18
(2/3)x^(3/2) = 18
(2/3)(a^3/2 - 0) = 18
a^3/2 = 18 × 3/2
a^3/2 = 3^3
(√a)^3 = 3^3
√a = 3
a = 9