Q1a, x=6, x=-5
b. a=6
2a. dy/dx = (20-4x^2)/(x^2+5)^2
b. x>rt(5) x<-rt(5)
3a. rt(5)cos(theta +26.57)
b. theta = 33.0, 273.9
c. theta = 86.1
4a. y=21, x=ln(2.5)
y=25 (k=25)
b. Proof
c. x1= 1.4368
x2= 1.4373
d. Show the change in sign. (gradient function)
5i. Turning points: 0.9463
ii. 0.5cosec(4y)
6a. A=3 B=4
b. x+2y-35=0 (or equivalent)
7a. arcsin(x) graph
b. x= -(2+rt(3))/2
8a. Proof
b. x= 0.294, -1.277, 1.865 and 1 more I think
9a. 6.740
b. Proof
c. T = 5ln(2+(2/e))

Reply 1245

Ecomaths

1

How do we start a petition to lower the grade boundary?

Reply 1246

d14m

2

Original post by mk_98

What did everyone get for the value of k (asymptote) on the graph. I got 21

I got 21 as my value of Y where x=0 , My value of k was 25

Reply 1247

WillRose

2

I did fcking partial fractions for that question and got 13 and 20, really messed that up :/ , can anyone tell me how many marks the question was out of/ how many marks I'd get for doing the second part of the question but with what I'd worked out

Reply 1248

philo-jitsu

2

Did question 2 simplify after finding dy/dx!??!?!??!

What the **** ..everything else was alright that ****er got me

Reply 1249

metrize

18

Y intercept 21 k was 25

Edexcel wants beef

Original post by AQATrolledMe

How do you show that the amount of antibiotics left wass 13. something?

If you mean on 9b, you had to do

15e^-0.2(7) + 15e^-0.2(2) to get what's left of the first dose after 7 hours (the first five then the two after the second dose) added to what's left of the second dose after 2 hours. Not totally sure about the formula/model but I think that was the right method.

Reply 1252

Smithy1597

1

What was the range for question 8

Reply 1253

blahblah21

4

Original post by blahblah21

Q1a, x=6, x=-5
b. a=6
2a. dy/dx = (20-4x^2)/(x^2+5)^2
b. x>rt(5) x<-rt(5)
3a. rt(5)cos(theta +26.57)
b. theta = 33.0, 273.9
c. theta = 86.1
4a. y=21, x=ln(2.5)
y=25 (k=25)
b. Proof
c. x1= 1.4368
x2= 1.4373
d. Show the change in sign. (gradient function)
5i. Turning points: 0.9463
ii. 0.5cosec(4y)
6a. A=3 B=4
b. x+2y-35=0 (or equivalent)
7a. arcsin(x) graph
b. x= -(2+rt(3))/2
8a. Proof
b. x= 0.294, -1.277, 1.865 and 1 more I think
9a. 6.740
b. Proof
c. T = 5ln(2+(2/e))

Correct me if im wrong please (: