Use the Substitution method to integrate the following definite integral: 6. J. 8x(2x2 + 3 )dx 7. [x2 ( x3 - 5/ dx 3x2 8. dx (x3 + 1) 9. ['4xe * +2 dx Use whatever method you can to solve the following: 10. 3x dx ---- substitution doesn't work for this one. Try (x +1) integration by parts