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Mr M's OCR (not OCR MEI) Core 2 Answers May 2017

Mr M's OCR (not OCR MEI) Core 2 Answers May 2017

1. (i) 4 (4 marks)

(ii)

6 \sqrt 3

(2 marks)

2. (i) 0.715 (4 marks)

(ii) Underestimate because trapeziums lie under the curve (2 marks)

3. (i)

1+4x+7x^2+7x^3

(4 marks)

(ii) 11 (2 marks)

4.

y=2x^{\frac{5}{2}}-5x^2+27

(6 marks)

5. 2.19 (6 marks)

6.

\frac{11}{6}

(7 marks)

7. a) 314 (4 marks)

b) i) Show

y=2x^2-1

(4 marks)

ii) x=2 and y=7 or x=3 and y=17 (4 marks)

8. a)

a=-24

(5 marks)

b)

a=30-14\sqrt2

(6 marks)

9. (i) Show and

f(x)=(2x-1)(2x^2+x+5)

(4 marks)

ii) a) Show (4 marks)

b)

\theta=\frac{\pi}{12}

and

\theta = \frac{5\pi}{12}

and

\theta=\frac{13\pi}{12}

and

\theta=\frac{17\pi}{12}

(4 marks)

Heck. 9 was wrong. Now fixed.

(edited 6 years ago)

Scroll to see replies

Reply 1

temmerson

I do believe that there should be 4 answers to the final question, because it was actually sin(2*theta) rather than sin(theta)

**EDIT** - This has now been fixed

(edited 6 years ago)

Reply 2

Saaam1234

What was question 5? (Not the answer. The question)

Reply 3

username2216215

Original post by temmerson

I do believe that there should be 4 answers to the final question, because it was actually sin(2*theta) rather than sin(theta)

You are incorrect, it was 100% 0.5sin(√theta) not sin(2*theta)

Reply 4

Kevin.M

The answer to the last Q is wrong there is 4 solutions

Reply 5

username2216215

Original post by Saaam1234

What was question 5? (Not the answer. The question)

Rhombus question?

Reply 6

deardood

Are there not 4 solutions for last part of last question? As 2x divides by two so answers also fit in range 0<x< 2pi to get 390 degrees and 520 degrees which when divided by 2 also fit in range (change to radians)...

Reply 7

Mr M

Study Forum Helper

Original post by Saaam1234

What was question 5? (Not the answer. The question)

Sector AOB arc length 6 cm and sector area 24 cm^2. Find area of shaded segment to 3 sf.

Reply 8

AaronC88

I did the trapezium rule equation is degrees so I got the wrong answer.
Also I got x=-2 and x=-3 for 7bii) still got the right y co-ordinates.

How many marks would I lose for these mistakes thanks!

Reply 9

Kevin.M

Mr M these solutions are missing 13/12 pi and 17/12 pi

(edited 6 years ago)

Reply 10

phat-chewbacca

What was 3(i) and (ii)?

Reply 11

shreys

Dear Mr. M, are you sure there's only 2 answers for the final part?

Reply 12

Mr M

Study Forum Helper

Original post by temmerson

I do believe that there should be 4 answers to the final question, because it was actually sin(2*theta) rather than sin(theta)

Sorry. Now fixed.

Reply 13

Bwile12

I got x=3 on q1 because I -4 instead of adding it...how many marks would I lose for both part one and two?

Reply 14

shreys

Dear Mr. M, how many marks would I lose for getting the four correct answers at the end but eliminating two of them so I only gave two angles for my final answer?

Reply 15

Mr M

Study Forum Helper

Original post by AaronC88

I did the trapezium rule equation is degrees so I got the wrong answer.
Also I got x=-2 and x=-3 for 7bii) still got the right y co-ordinates.

How many marks would I lose for these mistakes thanks!