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Paper 12 maths
- Thread starter roadtrip9o9
- Start date
a =5 is correct. Im Sure
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hey!!! do u have any idea abt that que (AP and GP) question no (ii)....?????
i went blank on it.
i went blank on it.
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Here's the solution to it, IIRC:
ar = a - 9, and from this we get r = (a - 9) / a
ar^2 = 30
a [(a-9) / a ]^2 + (a - 9) = 30
Solve for A to get the answer.
ar = a - 9, and from this we get r = (a - 9) / a
ar^2 = 30
a [(a-9) / a ]^2 + (a - 9) = 30
Solve for A to get the answer.
But did you take the whole B in the formula? Or just x^3? The coefficient of x should have been taken into consideration too.
Do you remember the whole binomial question?
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Yeah, it was definitely 10a^2 - 160 = 90, then you get a as +5. There were 2 coefficients of X, one was 5C2 * a^2 but I can't remember the other.
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what was the solution for the trigo question?? I spent lot of time on it but not sure whether its right.
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The paper quite extended, but I managed it in 1 1/4 hours, leaving 30 minutes for revision. Here are some of the answers:
(volume of rotation about x-axis): 12 pi
binomial theorem: a= 5
GP>> first term (a)= 27
AP>> a = 9, d= 2
unit vector scalar multiple: 1/sqr(61)
(coordinates): A(4,6), B(2,2)
(Area): 28/3
functions: g-1(x) = (8/x)+3; undefined when x=0
0<k<64/9
(volume of rotation about x-axis): 12 pi
binomial theorem: a= 5
GP>> first term (a)= 27
AP>> a = 9, d= 2
unit vector scalar multiple: 1/sqr(61)
(coordinates): A(4,6), B(2,2)
(Area): 28/3
functions: g-1(x) = (8/x)+3; undefined when x=0
0<k<64/9
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Salam everyone...In my opinion the paper was quite easy..All the question were easy except that AP GP one which was little bit tricky..in my centre most the people found it easy..What Range of values of k.. u guys wrote in last question??..ANd i got +-8/3 value of k....Can anyone share his/her answers for vector question.?
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Yeah, The paper was really tough. I hope i will get around 60. And am also guessing the threshold will be around 60.
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0<k<(64/9) [using the logic that the discriminant (b^2 - 4.a.c)<0 if there are 'no solutions']
i got root 61 ....
i got a = 42
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one vector i think was 2i 3j and 4k while another one was 5i 0j and 6k..i cant remember exactly and yes the magnitude was root 61
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the answers were q.1 volume =12pi
binomial a=5
trignometry..45 degree and 119degree or 116.something
a.p, d=2 and a=9
g.p, a=27
the coordinates of a and b were (4,6) and (2,2)
and the area in the last question was 28/3
i got these and i think i'm correct
binomial a=5
trignometry..45 degree and 119degree or 116.something
a.p, d=2 and a=9
g.p, a=27
the coordinates of a and b were (4,6) and (2,2)
and the area in the last question was 28/3
i got these and i think i'm correct
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Guys i made a silly mistake...instead of writing 2 answers for the trignometric question i wrote all 4 ( didn't look at the domain of x )..but my answers were correct. Do you think i'll lose marks for that coz the cambridge people are really lineant at marking..
the answer for the binomial is 5
