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# Integration question Watch

1. http://www.ocr.org.uk/Images/61388-q...hematics-2.pdf

Question 4

I got for the first part 22(4/5)

What does this value represent I thought it represents the shaded region but it does not?
2. (Original post by IShouldBeRevising_)
http://www.ocr.org.uk/Images/61388-q...hematics-2.pdf

Question 4

I got he first part the 22(4/5)

What does this value represent I thought it represents the shaded region but it does not?
You need the area under the line (the shape is a rectangle) minus the area under the curve
3. (Original post by IShouldBeRevising_)
http://www.ocr.org.uk/Images/61388-q...hematics-2.pdf

Question 4

I got he first part the 22(4/5)

What does this value represent I thought it represents the shaded region but it does not?
Depends what you evaluated! integration usually gives you the area underneath a curve - typically between a curve and the x-axis. You may need to subtract the area you've found from the area of a rectangle to get the area of the shaded part.
4. (Original post by Indeterminate)
You need the area under the line (the shape is a rectangle) minus the area under the curve

(Original post by davros)
Depends what you evaluated! integration usually gives you the area underneath a curve - typically between a curve and the x-axis. You may need to subtract the area you've found from the area of a rectangle to get the area of the shaded part.
I did the exact thing in the mark scheme but did not subtract my answer form the area of the rectangle... I thought the work I did gave the area of the shaded region?

Here is the mark scheme

http://www.ocr.org.uk/Images/59336-m...me-january.pdf
5. (Original post by IShouldBeRevising_)
http://www.ocr.org.uk/Images/61388-q...hematics-2.pdf

Question 4

I got for the first part 22(4/5)

What does this value represent I thought it represents the shaded region but it does not?
will give you the area underneath the curve.
Then work out the Area of rectangle which is and subtract this to get the required area.

(sorry, limits were supposed to be -2 and 2)
6. (Original post by gaffer dean)
will give you the area underneath the curve.
Then work out the Area of rectangle which is and subtract this to get the required area.
Oh right yes thank you.. I thought integration gave you the area of the shaded region.
7. (Original post by IShouldBeRevising_)
Oh right yes thank you.. I thought integration gave you the area of the shaded region.
you're welcome, read section 11.2 in the book if you still don't understand.
BTW, limits were supposed to be -2 and 2.

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