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# help pls (ocr additional maths paper) watch

1. I drew up a little diagram in photoshop of the question I'm stuck on..

http://jdesign.org/question.jpg

I think I've done it right so far, but I've written the question down just in case.

I need to know how to find the area (idk if this is even the right place to ask but I am desperate )
2. Find where curve algebra = 0

x^2 - 3x = 0
x(x - 3) = 0
so x = 0 or 3

You've drawn the area wrong... the curve passes through (0,0) surely?

If so:

Area of Triangle - Integral between 0 and 1 of (x^2 - 3x)
3. put the 2 lines equal to each other and rearrange...integrate that equation for the area of the sail..
4. (Original post by Mat666)
Find where curve algebra = 0

x^2 - 3x = 0
x(x - 3) = 0
so x = 0 or 3

You've drawn the area wrong... the curve passes through (0,0) surely?

If so:

Area of Triangle - Integral between 0 and 1 of (x^2 - 3x)

Yeah, the curve passes through (0, 0) I drew it wrong lol.

I'm really new to all this stuff, so I don't really know what you're talking about Some school wants me to take a test to get in, and this was a q on last years paper :/
5. (i) y = 3x - x²
y' = 3 - 2x
=======

(ii)B(1,2)
at x = 1, y' = 3 - 2 = 1
y' = 1
====
Tangent to y at B has gradient m = 1

y - y1 = m(x - x1)
y - 2 = 1.(x - 1)
y - 2 = x - 1
y = x + 1
======

(iii)
The tangent cuts the x-axis at y = 0
=>x = -1
=====
Therefore A is (0, -1)
===============

(iv)
Area of sail is area of triangle with AB as its hypotenuse minus the area under the curve y = 3x - x² from x = 0 to x = 1.
Area of triangle = A1 = ½.2.2 = 2
A1 = 2 sq units
==========

A2 = ∫ {0 -> 1} 3x - x² dx
A2 = [3x²/2 - x³/3]{0 -> 1}
A2 = 3/2 - 1/3
A2 = 7/6
======

A = A1 - A2
A = 2 - 7/6
A = 5/6
=====
Attached Images

6. (Original post by hughy)
I drew up a little diagram in photoshop of the question I'm stuck on..

http://jdesign.org/question.jpg

I think I've done it right so far, but I've written the question down just in case.

I need to know how to find the area (idk if this is even the right place to ask but I am desperate )
Are you doing the additional maths FSMQ paper, I'm doing it at the moment aswell, I didn't think I would meet anyone who knew what it was!
7. (Original post by hughy)
Yeah, the curve passes through (0, 0) I drew it wrong lol.

I'm really new to all this stuff, so I don't really know what you're talking about Some school wants me to take a test to get in, and this was a q on last years paper :/
have you worked through the textbook for add.maths, is it being taught to you at school, because this stuff you really need to be taught how to do.
8. (Original post by Louise_1988)
have you worked through the textbook for add.maths, is it being taught to you at school, because this stuff you really need to be taught how to do.
Heh, I just moved to the UK from Canada, and I don't really know much of anything in the additional mathematics paper. I'm just sort of going through last years paper and trying to teach myself whatever is covered in it.
9. Fermat thx for the help. You explained it well

Also thanks to everyone else

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