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# Help with questions about finding the coordinates

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1. With this question , I tried substituting but I keep getting it wrong,
1/2 X + 1 = y
1/2 X + 1 = X2 +4X +3
0=X2+3.5X+2
From there i can't factorized from here.

(This paper from the C12 IAL paper Jan 2016)
2. (Original post by Cake_Chan)

With this question , I tried substituting but I keep getting it wrong,
1/2 X + 1 = y
1/2 X + 1 = X2 +4X +3
0=X2+3.5X+2
From there i can't factorized from here.

(This paper from the C12 IAL paper Jan 2016)
Fine so far.

You'll need to use the quadratic formula - it doesn't have a nice factorization.
3. (Original post by Cake_Chan)

With this question , I tried substituting but I keep getting it wrong,
1/2 X + 1 = y
1/2 X + 1 = X2 +4X +3
0=X2+3.5X+2
From there i can't factorized from here.

(This paper from the C12 IAL paper Jan 2016)
Not factorisable over the rationals. Use the quadratic formula.
4. Could they ask you to find this area?

If yes, what would you do after establishing the area of the trapezium?
5. The question is an error, the curve is meant to be x^2 -4x+3, we went over this exact question today in class ;p
Could they ask you to find this area?

If yes, what would you do after establishing the area of the trapezium?
Area of trapezium - integral of curve for QS - integral of curve for TP
7. What do you mean by integral curve for QS - TP?
8. (Original post by JN17)
The question is an error, the curve is meant to be x^2 -4x+3, we went over this exact question today in class ;p
This was my paper.
9. theres nothing wrong with the paper, I did this earlier and got it right. However my method is very long but effective ;D

Find the area under the line of y=1/2x+1 with the intervals. (Let this be L)
then find the area under the curve of y+x^2+4x+3 with the intervals P and T
and then.... find the area under the curve of y=x^2+4x+3 with intervals Q and S and add those together. (Let this be R)

10. (Original post by Zacken)
This was my paper.
I've just checked an online version of the paper and it had it written as -4x, might have been a mistake that was seen after the exam but the question factorizes nicely with it and the area is much simpler.
11. (Original post by JN17)
I've just checked an online version of the paper and it had it written as -4x, might have been a mistake that was seen after the exam but the question factorizes nicely with it and the area is much simpler.
I think I remember getting nice values in my exam though. Not sure.
12. (Original post by Zacken)
I think I remember getting nice values in my exam though. Not sure.
Did u get an a* in maths

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13. (Original post by imran_)
Did u get an a* in maths

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Something like 597/600 iirc.

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