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maths p32 answers

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hmm, well if you're right, this means a loss of 1 mark, coz we were right everywhere else!
 
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wouldn't e^2x/2 get cancelled when we take ln?
The question was dy/dx=e^(2x+y) right?

dy/dx=e(2x+y)
dy/dx=e^(2x) x e^( y )
[1/e^( y )] dy = e^(2x) dx
e^(-y) dy = e^(2x) dx

Integrate both the sides.

-e^(-y) = [e^(2x)/2] + c

Put x=0 and y=0 to find the value of 'c'.

-e^(-y) = [e^(2x)/2] + c
-e^(-0) = [e^(0)/2] + c
-1 = (1/2) + c
-1 - (1/2) = c
-3/2 = c

Put back this value of 'c' in the integrated solution.

-e^(-y) = [e^(2x)/2] + c
-e^(-y) = [e^(2x)/2] - (3/2)

Multiply the equation by a '-' sign.

- {-e^(-y) = [e^(2x)/2] - (3/2)}
e^(-y) = (3/2) - [e^(2x)/2]

Put 'ln' on both the sides.

ln e^(-y) = ln {(3/2) - [e^(2x)/2]}
-y = ln {(3/2) - [e^(2x)/2]}
y = - ln {(3/2) - [e^(2x)/2]}

Therefore, the answer was 'y = - ln {(3/2) - [e^(2x)/2]}'.
You can simplify this further.

Final answer : y = ln(2/(3-e^2x))
 
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paper was hard :( :( :( :( :( :( :( :( :( :( :( :( :( :( :(
hope thresholds will be low


pretty disappointing after seeing how easy m1 and p1 was. i was going for A* in maths but...oh well.....
 
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guys what will happen if idid not arranged the answer sheet in order but i have written the questions numbers on the side some one pls? pls help so
 
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Did you do the parts of the questions in order? As long as you did that, I think you should be OK.
ya
i did that in order and for each part I havee written it in one page and no continuation on other page and if there was continuation i have written question number and part of that question beside it and on the top of it,like question 2 part ii and etc
so do u think thts fine ?
 
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ya i did that in order and for each part I havee written it in one page and no continuation on other page and if there was continuation i have written question number and part of that question beside it and on the top of it,like question 2 part ii and etc so do u think thts fine ?
 
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the answer to vectors third part is wrong. i think the distance was 12 between two points.
 
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