Turn on thread page Beta
 You are Here: Home >< Maths

HELP with this question error in book watch

1. Question

Find the shaded area .

equation of the curve =
therefore

books's answer = 4
my solution

lower limit = 1, upper limit= 4
lower limit = 1, upper limit= 4
lower limit = 1, upper limit= 4

The book says that the answer is 4 however i got 2
I dont understand if the book is wrong
i only got 4 if the lower limit is changed to 0
2. (Original post by bigmansouf)
Question

Find the shaded area .

books's answer = 4
my solution

lower limit = 1, upper limit= 4
lower limit = 1, upper limit= 4
lower limit = 1, upper limit= 4

The book says that the answer is 4 however i got 2
I dont understand if the book is wrong
i only got 4 if the lower limit is changed to 0
What is the equation of the curve?

Edit: I assume ?

If so then your integral is only accounting for the area on one side of the y-axis so you would have to double it.
3. jeez that looks boring.

Hope i helped
4. (Original post by 16Characters....)
What is the equation of the curve?

Edit: I assume ?

If so then your integral is only accounting for the area on one side of the y-axis so you would have to double it.
sorry i edited it thank you

equation
5. (Original post by bigmansouf)
sorry i edited it thank you

equation
The issue is that if then so when you find

you are actually finding only the area between 1 of the two parts of the curve and the y-axis as opposed to the two different parts of the curve. Not to worry however as symmetry comes to your rescue; the area between the two parts of the curve is double the area between one part of the curve and the y-axis.
6. (Original post by 16Characters....)
The issue is that if then so when you find

you are actually finding only the area between 1 of the two parts of the curve and the y-axis as opposed to the two different parts of the curve. Not to worry however as symmetry comes to your rescue; the area between the two parts of the curve is double the area between one part of the curve and the y-axis.

thanks since it is two curves thanks

Turn on thread page Beta

Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 26, 2015
Today on TSR

Exam Jam 2018

Join thousands of students this half term

Poll
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

Study habits of A* students

Top tips from students who have already aced their exams

Create your own Study Planner

Never miss a deadline again

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