davidgoes4wce
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I spotted a Mistake in Max Shur book tonight Q2a and Q2e are wrong
davidgoes4wce Useful Maths Ext 1 Questions & Textbook Errata 2015-2016 (1 Viewer)
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davidgoes4wce
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Re: Mistakes from Text Book Thread
Solution To Q2a in Max Shur book (Year 11) should be dy/dx=16(2x+3)^-5
Solution To Q2a in Max Shur book (Year 11) should be dy/dx=16(2x+3)^-5
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
Solution to Q2e to Max Shur book (Year 11) should be :
Solution to Q2e to Max Shur book (Year 11) should be :
Re: Mistakes from Text Book Thread
Good thing you made this as a thread so that all errors are documented in one place. Do you think you'll eventually go back through your old Marathon posts where you posted other errors and transfer them to here too?
Good thing you made this as a thread so that all errors are documented in one place. Do you think you'll eventually go back through your old Marathon posts where you posted other errors and transfer them to here too?
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
I have a rule, once I do a question , I don't redo that question again unless a specific student requests that I go through it again with them.
Nah I have a life mate!
I have a rule, once I do a question , I don't redo that question again unless a specific student requests that I go through it again with them.
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
Another mistake on Dr Max Shurs' book:
Q2h of the same page:
The answer has: 9x^2+(3/2x^(3/2))
Thats my working out, 3 mistakes on the same page and we all thought Grove was bad!
Another mistake on Dr Max Shurs' book:
Q2h of the same page:
The answer has: 9x^2+(3/2x^(3/2))
Thats my working out, 3 mistakes on the same page and we all thought Grove was bad!
dan964
what
Re: Mistakes from Text Book Thread
Most textbooks have errors; I know the ext 1 textbook; although fairly solid content/exercises; often had occasionally mistakes.
Terry Lee's errata for his ext 1 book are here: http://www.hsccoaching.com/documents/35.html
Most textbooks have errors; I know the ext 1 textbook; although fairly solid content/exercises; often had occasionally mistakes.
Terry Lee's errata for his ext 1 book are here: http://www.hsccoaching.com/documents/35.html
Last edited:
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
I think there is a mistake in Q4 as well.
The solution has:
x+2y-1=0 at x=1
and x-2y+1=0 at x=-1
I had something along the lines of this:
Would be good if somebody could confirm.
I think there is a mistake in Q4 as well.
The solution has:
x+2y-1=0 at x=1
and x-2y+1=0 at x=-1
I had something along the lines of this:
Would be good if somebody could confirm.
axwe7
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Re: Mistakes from Text Book Thread
I remember this really hard Trigonometry question, and the answer was a mistake...
Just a thumbs up.
Cheers.
Yeah dude, I've done some of that book before, the same one, Understanding Math, and albeit the fact that I'm finding it really helpful, I too have noticed a few mistakes.I spotted a Mistake in Max Shur book tonight Q2a and Q2e are wrong
I remember this really hard Trigonometry question, and the answer was a mistake...
Just a thumbs up.
Cheers.
Re: Mistakes from Text Book Thread
$ is a fourth-degree polynomial, so $y^\prime (x)$ should be a third-degree polynomial. In this case, it is easier to just expand out: $y(x) = x^2 \left(x^2 -1\right)=x^4 - x^2 $, so the derivative is $y^\prime (x) = 4x^3 - 2x$.$)
I think there is a mistake in Q4 as well.
The solution has:
x+2y-1=0 at x=1
and x-2y+1=0 at x=-1
I had something along the lines of this:
Would be good if somebody could confirm.
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
My bad it should have been 4x^3-2x, I used the product rule but added wrong. I have no excuses, it was carelessness.
My bad it should have been 4x^3-2x, I used the product rule but added wrong. I have no excuses, it was carelessness.
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
Just in case you guys were keen I corrected my working for Q4:
Just in case you guys were keen I corrected my working for Q4:
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
But I did Q6 and I think there is a mistake with the solution:
This was the question:
This was the solution in the textbook:
But I did Q6 and I think there is a mistake with the solution:
This was the question:
This was the solution in the textbook:
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
My working out for the solution:
My working out for the solution:
Re: Mistakes from Text Book Thread
Since we just want the slope of the tangent, we don't need to figure out the entire equation of the tangent. We can just sub. the x-value into the equation for dy/dx to get the slope.
My working out for the solution:
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
Yep I know that, I found the equation just for my own interest.
Yep I know that, I found the equation just for my own interest.
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
The way they have drawn this up in Grove, doesn't look quite right:
The way they have drawn this up in Grove, doesn't look quite right:
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
Mistake in the Cambridge 2 Unit Enhanced textbook from Bill Pender, David Sadler , Julia Shea and Derek Ward.
The Amount owed should have be written as:
}{0.0065} )
Still unsure about the instalment statments, whether they are right or wrong.
Mistake in the Cambridge 2 Unit Enhanced textbook from Bill Pender, David Sadler , Julia Shea and Derek Ward.
The Amount owed should have be written as:
Still unsure about the instalment statments, whether they are right or wrong.
davidgoes4wce
Well-Known Member
Re: Mistakes from Text Book Thread
Mistake in the 4U solutions by Brown, Coffey, Muddle, Kovacs, Sekaran and Dillon in Exercise 5.1 , Q 5a
 has this: $ )
Mistake in the 4U solutions by Brown, Coffey, Muddle, Kovacs, Sekaran and Dillon in Exercise 5.1 , Q 5a
