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OCR C3 paper 20/06/2017

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I did y = a^x
ln y = ln a^x
ln y = x ln a
x = ( ln y ) * 1/( ln a )
dx/dy = 1/y * 1/( ln a )
dy/dx = y ln a
(sub y = a^x)
dy/dx = a^x ln a

I got that!

Reply 41

GGHarambe

What was N? i got like 3800 and something, pretty sure it's wrong

Reply 42

Brolicduck

can someone tell me what mark each Q was worth?

Reply 43

andywong99

Original post by GGHarambe

What was N? i got like 3800 and something, pretty sure it's wrong

Nah I checked on my calc and it was something close to 3800, can't remember exact number.

Reply 44

Heyitsmerhi

Original post by GGHarambe

What was N? i got like 3800 and something, pretty sure it's wrong

I got that too, it was like e^of something

Reply 45

Bigzy

Original post by GGHarambe

I got that!

I managed to get the first 3 parts, but couldn't work out how to prove dy/dx

Reply 46

Aerospengie

Original post by GGHarambe

What was N? i got like 3800 and something, pretty sure it's wrong

Nope, it was ~3867 i think
Q was |lnN - 10.5| <6

Reply 47

username3407046

Original post by Heyitsmerhi

I got that too, it was like e^of something

e^8.25 ?

Reply 48

Aerospengie

Original post by GGHarambe

What was N? i got like 3800 and something, pretty sure it's wrong

Nope, it was ~3867 i think
Q was |lnN - 10.5| <6

Reply 49

andywong99

Original post by Heyitsmerhi

I got that too, it was like e^of something

Yeah e^8.25 which is 3827. Something so N was 3827

Reply 50

QWERTY166

What was the range of the function?

Reply 51

Aerospengie

Original post by QWERTY166

What was the range of the function?

Equal to or less than 3, greater than 0

Reply 52

Bigzy

Original post by Bigzy

I managed to get the first 3 parts, but couldn't work out how to prove dy/dx

Now I see what I didn't do. I should have done dx/dy and then flipped it to dy/dx. Damn

Reply 53

username3407046

How to do question 8?
I got R=10 and alpha=36.9

Reply 54

GGHarambe

Original post by andywong99

Yeah e^8.25 which is 3827. Something so N was 3827

Yeah that's the number I got

Reply 55

Aerospengie

Original post by c.w.l.c

How to do question 8?
I got R=10 and alpha=36.9

Alpha was about 60 wasn't it

Reply 56

Heyitsmerhi

Original post by andywong99

Yeah e^8.25 which is 3827. Something so N was 3827

Do you think I'd lose a mark for keeping it as e^8.25?

Reply 57

QWERTY166

Original post by Aerospengie

Equal to or less than 3, greater than 0

How??

Reply 58

Vanilla Poison

Original post by QWERTY166

What was the range of the function?

0<f(x)≤3 is what I put...

Reply 59

Mowgli66

Anyone get 10sin (x-53.1) for I think q8?

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OCR C3 paper 20/06/2017

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