Question 8 b (iv) (1 Viewer)

[Managore]

How did Everyone get 18 for this section? I ended up with 11.. could someone please explain their working?

 

[Bi0mic]

being that i somehow came across 62, i dont like my chances of explanation ...

way im reading it the separate triange + integral? ... id be interested to see the working aswell

 

[smallcattle]

integrate from -8 to 4, 2 - x/4 - x^2/16

 

[Managore]

I have.. twice.. and my answer always comes out as 11

 

[intuition]

how did you get 11?

it is definitely 18

 

[Managore]

Then show me the working out so I can see where I'm going wrong please

 

[superbird]

Then show me the working out so I can see where I'm going wrong please

why??? you've finished maths for good!

 

[smallcattle]

integrate and you will get [2x - x^2/8 - x^3/48]

 

[greeninsanity]

I have.. twice.. and my answer always comes out as 11

show us how you're integrating it...

 

[~*HSC 4 life*~]

i got 18units squared

its intergrate top curve (ie y= 2/ x/4) minus integrate bottom curve ie parabola between x= -8 and x=4

 

[Managore]

Goddammit Yeah you're right.. same error in calculation twice... Im such an asshole.. there goes my decent UAI

 

[Sweet_Lemon]

How did Everyone get 18 for this section? I ended up with 11.. could someone please explain their working?

wakakaka~~ lalala..i got tat rite~~ ekekekkekekk

 

[Managore]

why??? you've finished maths for good!

Heh... I still have extension 1 on wednesday.. and I can't even use a calculator properly

 

[intuition]

after the integration you should get....

[(8 - 2) – (-16 – 8)] – [(64/48) – (-512/48)]
= (6 + 24) – (4/3 + 32/3)
= 30 – 12
=18

 

[Willmaker]

Ok 1st integrate - (x^2/16) - [2 - (x/4)]
This will give you (x^3/48) - 2x + (x^2/8)
Sub in x=4 This will give you 64/48 - 8 + 2
Sub in x=-8 This will give you -512/48 + 16 + 8

Now [(64/48 - 8 + 2) - (-512/48 + 16 + 8)]

This will leave you with -14/3 - (-104/3)

Solving gives you -18 but you take the absolute value.

 

[Katie123]

thats a hmmmm
i think i messed that part up

 

[absolution*]

woot. first question i know of so far that i got right.

 

[bloodysunday]

mhaha.. mhaha.. mhaha, i got it right, two marks for me

 

[lucyinthehole]

i wish i remembered what i got for that.....

 

[monkey187]

I got 18 but i used 18 for the 2nd part as my area for the top half of the shaded area!! so my total area was 36!!!