Q16 Share your answers here (2 Viewers)

[jade2198]

Please share your answers for Q16 here

 

[Mr Hippopotamus]

All I did was the f'(x) question...and the similar triangles proof.....THAT IS ALL...

 

[venpat]

16a is 2x^2 -3x+1 right?

 

[Recondit]

16a is 2x^2 -3x+1 right?

yes

i skipped b)iv) cos i kept getting no solution
and c)ii) I just used similar triangles twice and left it there cos i was braindead

 

[Mr Hippopotamus]

16a is 2x^2 -3x+1 right?

-2 at the end....

Because the gradient=5 when x=2...
and when x=2, y=0
so integrate f'(x) to get f(x).....sub in 0 and 2...to get C...and C=-2

At least that's what I did....correct me if I'm wrong

 

[Samir97]

16a is 2x^2 -3x+1 right?

Correct

 

[Samir97]

-2 at the end....

Because the gradient=5 when x=2...
and when x=2, y=0
so integrate f'(x) to get f(x).....sub in 0 and 2...to get C...and C=-2

At least that's what I did....correct me if I'm wrong

Y = 3 not 0

 

[venpat]

When x =2, y=3 for the y=5x-7

 

[Mr Hippopotamus]

When x =2, y=3 for the y=5x-7

y=5x-7 is a tangent to the curve...at x=2....so when x=2 y=0.....where am I wrong....someone spell it out for me...

 

[spammer]

16 c ii)
HELP!!!!

 

[lolwot]

i did 16a)

I got to 0 = (-8)^2-4*2(-7+C) using discriminant
the solved it wrong and put C=8/3 LOL

 

[venpat]

y=5(2)-7=3

 

[khoavo12]

16c (ii) this is what i did

 

[dshah73]

Q 16 c (II) AND 16 B (IV)(V) WTF!!!!

 

[hjed]

with b) iv.
I got the derivative of N and set it equal to dP/dt (which is probably 2/3 marks), but I couldn't work out how to eliminate P.

 

[Randox]

with b) iv.
I got the derivative of N and set it equal to dP/dt (which is probably 2/3 marks), but I couldn't work out how to eliminate P.

same haha. i got 40 months. What did u get?

 

[Shazer2]

with b) iv.
I got the derivative of N and set it equal to dP/dt (which is probably 2/3 marks), but I couldn't work out how to eliminate P.

Yep I did that too!

 

[Randox]

Yep I did that too!

what did u get as your months?

 

[hjed]

same haha. i got 40 months. What did u get?

I couldn't eliminate P, so I didn't get an answer (and pens down before I had time to make one up). How did you get 40?

 

[Shazer2]

what did u get as your months?

I didn't solve it. I just derived N, and set it to dP/dt.