11 need help

11. Pick 3 of the following to integrate. If using a u-substitution, be sure to clearly indicate u, dx, the integral in terms of u, and the work that justifies the final solution. Give exact solutions. 10 pts each a. x+2 = dx let whe youpor then dy = Vx2+4x b. Je 1 x.In x dx c. S( x + 1) ( 2x + x2)8 dx x3 d. dx (x2+8) 4