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# core maths c12 10 jan 2017 watch

1. (Original post by mr.holmes)
but they asked you to find the value for x or what exactly?
i thought we use the y for substituting in the equation
We could have substituted y or solved the question merely through logarithm laws which is what I did.

Just think about it if x=81, log3(81) gives 4 which is y. And therefore the expression which Summaiya got for log3 (x/9), y-2, is equals to 2. If you sub x=81 in, you end up with y-2 equaling 2.
2. (Original post by Helper OF ALL)
so is my answer right....
Yes
3. (Original post by Helper OF ALL)
i got y= 1/5 and x= 81...
and i think these are correct.. becuz i confirmed it with ma fellows
could you please tell me what the question wanted?
i actually forgot and i think i did not read it well.
4. (Original post by Sumaiyya1999)
Yes
. relief in the A--........
tom is chem . gotta study it..
5. (Original post by mr.holmes)
could you please tell me what the question wanted?
i actually forgot and i think i did not read it well.
i really cant think about it ... sorry
6. (Original post by Sumaiyya1999)
O yes but that way way also u should get a quadratic equation cuz (x/9)^2 is x^2/9^2

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Well I suppose there is that way of solving the question too.
7. (Original post by Fasih178)
We could have substituted y or solved the question merely through logarithm laws which is what I did.

Just think about it if x=81, log3(81) gives 4 which is y. And therefore the expression which Summaiya got for log3 (x/9), y-2, is equals to 2. If you sub x=81 in, you end up with y-2 equaling 2.
so substituting is right?
and they asked you to find the value for y?
i think i did everything wrong..........
8. yea first one was y-3
9. (Original post by Helper OF ALL)
. relief in the A--........
tom is chem . gotta study it..
Best of luck
10. anyways, what was the value in the integration question or what was the method you used?
11. (Original post by lympho)
yea first one was y-3
y-3 not possible.......because log 9 to the base 3 is 2...

first was Y-2 and other was Y/2
12. When does the unofficial mark scheme come out?
13. (Original post by mr.holmes)
anyways, what was the value in the integration question or what was the method you used?
i used area under curve from 1 to 4 minus area of triangle from x=4 to x=1.8 adn height 11.

area of triangle = 1/2 * (4 - 1.8) * 11
14. (Original post by mr.holmes)
so substituting is right?
and they asked you to find the value for y?
i think i did everything wrong..........
Nah man even if you substituted the value of y and ended up with a quadratic equation, you're gonna gain at least 2 marks. The other two marks are for finding a solution of y if you did substitution. But if you solved it through log laws then the remaining two marks are for solution of x instead of y.
15. (Original post by mr.holmes)
anyways, what was the value in the integration question or what was the method you used?
5.something, i forget what the value was in fractions
16. (Original post by Helper OF ALL)
i used area under curve from 1 to 4 minus area of triangle from x=4 to x=1.8 adn height 11.

area of triangle = 1/2 * (4 - 1.8) * 11
That's precisely what I did as well.
17. (Original post by Helper OF ALL)
i used area under curve from 1 to 4 minus area of triangle from x=4 to x=1.8 adn height 11.

area of triangle = 1/2 * (4 - 1.8) * 11
I did that too
18. (Original post by Sumaiyya1999)
5.something, i forget what the value was in fractions
and what was the method you used?
19. (Original post by lympho)
When does the unofficial mark scheme come out?
What is that? Unofficial mark scheme?
20. (Original post by mr.holmes)
and what was the method you used?
Same as what fasih and helper of ALL did

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