The positive number aaa satisfies ∫0a(x+x2)dx=5\int_0^a(\sqrt x+x^2)\dd x=5∫0a(x+x2)dx=5 if Aa=3a=\sqrt3a=3Ba=(21−1)1/3a=(\sqrt{21}-1)^{1/3}a=(21−1)1/3Ca=32/3a=3^{2/3}a=32/3Da=52/3a=5^{2/3}a=52/3Ea=(6−1)2/3a=(\sqrt6-1)^{2/3}a=(6−1)2/3