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# Pure 1 Chapter 12 - Differentiation

Designed to accompany the Pearson Pure Mathematics Year 1/AS textbook.

## Miss J Wilson

### 25th Nov 2021 Flag Comment

How do we tell what type of stationary point? visual display slide. The "gradient just after" for "maximum point" says positive but should be negative

## Mr P Ross

### 5th Nov 2020 Flag Comment

Great slides, thank you. I have a comment on concave/convex. I feel that these are the wrong way round on slide 37. Although you can say that a concave down is the same as concave up, I believe that just saying 'concave' means the 2nd derivative is negative. The illustatration has them the other way around. Any other thoughts on this?

## Dr J Frost

### 14th Oct 2020 Flag Comment

I've fixed the errors listed.

## Mr A Blackett

### 28th Jan 2019 Flag Comment

Slide 46, should read "answer must either be ð’™=ðŸ-ðŸ/âˆšðŸ‘". Many thanks for the resources.

## Mr P Lambert

### 13th Jan 2019 Flag Comment

(Picking up on Mr. V Van Pelt comment, 5 Dec): Slide 13, example 5 looks to be incorrect. f'(x) = 49/2 x-to-the 5/2

## Mr V Van Pelt

### 5th Dec 2018 Flag Comment

slide 16 part a s/b -4 thanks, Jamie - VVP

## Mr V Van Pelt

### 5th Dec 2018 Flag Comment

slide 13 Q 5 looks like exponent incorrect. Thanks Jamie - VVP

## ?

### 23rd Mar 2018 Flag Comment

slide 16, 8(1/2) -8 should it not be -4 instead of 4 as 8*1/2 = 4, and 4 - 8= -4

## AH

### 14th Jan 2018 Flag Comment

Slide 4, I can't see anywhere squared of -3. The calculations are for the gradient.

## mummy

### 2nd Jan 2018 Flag Comment

slide 4, -3 squared is 9 not 6?

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