Please help me with Calculus

Solve the differential equation:

dT/du = -15u^2, T(0)=5


thank you so much

integrate to get T(u)= - 5u^3 + C
use initial condition to get 5= - 5*0^3 + C to get C=5
T(u)= - 5u^3 + 5

T(u) = -5u^3 + C

5 = C

T(u) = -5u^3 + 5