Qualification > Math
P1 Help Requested
elemis:
Okay looking at the diagram below, notice the red line. It is the shape of a trapezium.
You can find the area under the curve and from this value MINUS the area under the line.
First I found the two points at which the curve and line intersect :
x2 - 4x +4 = 7-2x
Hence, x2-2x -3 =0
Solving for x gives : 3 and -1
Inputting the above x values into 7-2x = y give corresponding y coordinates of : 1 and 9
Finding the area under the line :
Next I integrate the curve to get :
Inputting 3 into above gives a value of 1/3 .
Inputting -1 into abov gives : -9
Hence 1/3 - - 9 =
Hence, 20 - =
Deadly_king:
--- Quote from: Ari Ben Canaan on October 10, 2010, 02:37:09 pm ---Okay looking at the diagram below, notice the red line. It is the shape of a trapezium.
You can find the area under the curve and from this value MINUS the area under the line.
First I found the two points at which the curve and line intersect :
x2 - 4x +4 = 7-2x
Hence, x2-2x -3 =0
Solving for x gives : 3 and -1
Inputting the above x values into 7-2x = y give corresponding y coordinates of : 1 and 9
Finding the area under the line :
Next I integrate the curve to get :
Inputting 3 into above gives a value of 1/3 .
Inputting -1 into abov gives : -9
Hence 1/3 - - 9 =
Hence, 20 - =
--- End quote ---
Sorry........but can't see any diagram below.
Can you post the whole question ???
elemis:
--- Quote from: Deadly_king on October 10, 2010, 02:45:47 pm ---Sorry........but can't see any diagram below.
Can you post the whole question ???
--- End quote ---
A member requested some help regarding this question via PM.
This is my explanation to help that member ;)
Deadly_king:
--- Quote from: Ari Ben Canaan on October 10, 2010, 02:52:57 pm ---A member requested some help regarding this question via PM.
This is my explanation to help that member ;)
--- End quote ---
Oopz.....sorry br0 ;)
That's why I was wondering.....it looked more like an explanation ;)
elemis:
--- Quote from: Deadly_king on October 10, 2010, 02:55:00 pm ---Oopz.....sorry br0 ;)
That's why I was wondering.....it looked more like an explanation ;)
--- End quote ---
A long one too ,eh ? ;D
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