Turn on thread page Beta
    • Thread Starter

    Just checking that the internal x^5rt(x^3+1)
    can be done by either substitution or by parts. Can someone please confirm that the answer by substitution (i used x^3 +1) is 2/15(x^3+1)^5/2 - 2/9(x^3+1)^3/2 )
    I am checking this because the integration by parts method gives a different format.

    Thank you for you help

    Yes, your result is correct (assuming lots of things about your ambiguous bracketing or lack thereof).

    It's fairly easy to check answers using Wolfram Alpha - here's how I checked your integral without actually bothering to do it myself:


    Edit: also, differentiation is easier than integration, and you can always check by differentiating your result. You can also get Wolfram to do this too...

Submit reply
Turn on thread page Beta
Updated: February 7, 2017

University open days

  • Heriot-Watt University
    School of Textiles and Design Undergraduate
    Fri, 16 Nov '18
  • University of Roehampton
    All departments Undergraduate
    Sat, 17 Nov '18
  • Edge Hill University
    Faculty of Health and Social Care Undergraduate
    Sat, 17 Nov '18
Have you ever experienced bullying?
Useful resources

Make your revision easier


Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here


How to use LaTex

Writing equations the easy way


Best calculators for A level Maths

Tips on which model to get

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.