please explain.

Question 4 3 pts Evaluate 2x dx Vx2 + 1 Refer: use a substitution method Let u = x2 Show your work. If you get a wrong answer, you will still be awarded points, thus, show me your work neat and clean. Use a Math Editor or upload the image of your work. You can work on a piece of paper, then take a picture with your cell phone, and then upload it. Question 6 3 pts Evaluate x sinxax Refer: Integral by part. Let u = x2 Show your work. If you get a wrong answer, you will still be awarded points, thus, show me your work neat and clean. Use a Math Editor & or upload the image of your work. You can work on a piece of paper, then take a picture with your cell phone, and then upload it. D Question 8 3 pts Evaluate the limit. dx x3 - 2x+ x Refer: Partial Fraction Decomposition Show your work. If you get a wrong answer, you will still be awarded points, thus, show me your work neat and clean. Use a Math Editor or upload the image of your work. You can work on a piece of paper, then take a picture with your cell phone, and then upload it