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wjec c1 maths 13th may

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Reply 40

SomePaleChick

Original post by Mr rump

What did people get for 4b? I think I had 21/2 and -9/2? As x-3=+ or - 15/2

I got that too.

Reply 41

wellwhatcanisay

Hmmm why did you put 15/2?

Reply 42

VeepFan

i got the 21/2 but literally just as i figured that out it was time up so couldnt do the negative

Reply 43

VeepFan

for tanaBc I got lengthAC/LengthAB ??? anyone else get anythng like that

Reply 44

StarfishJ

I got Length DC/DB, because DC is perpendicular to AB and therefore makes a right angle, but there was no guarantee that AC was perpendicular to AB.

Reply 45

VeepFan

yeah i literally just took a guess :/

Reply 46

wellwhatcanisay

Original post by VeepFan

for tanaBc I got lengthAC/LengthAB ??? anyone else get anythng like that

Yeah I am almost certain I got that too

Reply 47

VeepFan

i cant even remember calculating D

everything went so badly

Reply 48

goodies

Original post by wellwhatcanisay

Yeah I am almost certain I got that too

yes that's correct. but i didn't know how to simplify my final answer :frown:

Reply 49

VeepFan

wasnt it something like, take the roots down to as low as they can go and then they cancel or something?

Reply 50

wellwhatcanisay

Original post by goodies

yes that's correct. but i didn't know how to simplify my final answer :frown:

Thanks for the reassurance :smile:

! And I think I simplified it to 1 over the square root of two

Reply 51

VeepFan

x=40 for the stationary points riddle?, i mean 'question'

Reply 52

StarfishJ

Yup I got x=40 too. I thought the question was alright! Makes a nice change from the usual C1 questions

I got tan=1/2

I had x=40 and put it back into the L equation to get L=80 is that correct? Or was I just meant to leave it after solving X

Reply 55

Mr rump

Original post by wellwhatcanisay

Yeah I am almost certain I got that too

I had root 20 over root 90 but I simplified it wrong! But think that is ac/ab

Reply 56

VeepFan

i think it is yeah, i just forgot :/// i know you had to do d^2L/dx^2 to show X>0 tf minimum

Reply 57

StarfishJ

Original post by blubba

I got tan=1/2

Same here.

Reply 58

VeepFan

and then on that weird binomial, i had n=5 and a=-3/2 ?

Reply 59

blubba

what were the ranges for q5? for the one where you needed to find the range of no real root values?

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wjec c1 maths 13th may

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