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Mathematics: Post your doubts here!

Nikesh

Nikesh

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Asimadnan said:
O/N/09/42 Q7
CAN ANY ONE PLZ HELP ME WITH PART 2!!

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w09_qp_42.pdf
Click to expand...

Use the formula Vaverage = Total distance travelled / total time taken
i.e.
--> let s1 be distance traveled till t= 50 s
-->i.e. s1 = 0.6 * 50^2 - 0.004 * 50^3 (use given equation of displacement which is x = 0.6t^2 - 0.004t^3) = 1000m
--> let s2 be distance traveled after t>=50s
--> i.e. s2= 30*t2 (where 30 is constant velocity "V")
--> now use the above formula
--> Vaverage = (s1+s2)/ (t1 + t2)
--> 27.5 = (1000 + 30t2)/ 50 + t2
--> Solve above equation and then calculate the value of t2
-->And then find total time i.e t = t1 + t2

 
R

reina81

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MJ2011 P32 Q10,iii i don't know how to find the gradient. i tried the method in the mark scheme but i still don't get it. Also when we solve questions involving "e" and say for eg. the question is e^x=3, find e, when we apply ln to both sides do we have to take the 3 as lne^3? and why because in some questions they do this and in others they take it as ln3. Please help. ASAP

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s11_qp_32.pdf

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s11_ms_32.pdf
 
leadingguy

leadingguy

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redapple20

redapple20

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leadingguy said:
http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s10_qp_33.pdf
http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s10_ms_33.pdf

question 8 part a how can we verify the roots ??? please show complete steps:(
same question part b, I have drawn but not sure abt it.. can any one draw it here fr me ????:cry:


I am posting it 3rd or 4rth tym I guess is there no one who can ans????
Click to expand...
put this root in place of x and if its equal to 0 then it's verified that its a root. Another root
Would b its conjugate ie 1- root 3 i
 
Most_UniQue

Most_UniQue

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Hey I had a question , when we integrate an equation twice , eg integrate the equation and then find the integral of the first integration , should we find the constant C in both equations or only once? Its imp , plz help...
 
G

GoodRobot

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Most_UniQue said:
Hey I had a question , when we integrate an equation twice , eg integrate the equation and then find the integral of the first integration , should we find the constant C in both equations or only once? Its imp , plz help...
Click to expand...

as in integration by parts ? then u do it once only
 
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