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Checkpoint description

Describe what's changed since the last checkpoint.

Elliott Fletcher 3 years, 11 months ago

Published this.
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Christian Lawson-Perfect 3 years, 11 months ago

Gave some feedback: Ready to use

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Christian Lawson-Perfect 3 years, 11 months ago

Saved a checkpoint:

I've split the last part, which asked you to find solutions after completing the square, into a separate question.

I moved the "Write the following expression in the form ..." text into the statement, because it's repeated for every part.

The advice now begins with a concise description of completing the square, which means the advice for the individual parts can just show how it's done.

The marking uses string restrictions, which just about does the job - you'd have to give a pretty artifical answer to get away with not completing the square - but it would be better if it did pattern-matching.

Restore this checkpoint

Hannah Aldous 3 years, 11 months ago

Gave some feedback: Needs to be tested

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Chris Graham 3 years, 11 months ago

Gave some feedback: Has some problems

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Chris Graham 3 years, 11 months ago

You seem to have sorted the pattern matching and there is a nice gradient of difficulty now.

In the part prompts, replacing e.g. "the expression" with "the following expression" will be clearer to the student.

I would suggest that part (d) becomes its own question, and then you could split this into two parts: the first part completing the square and the second finding the solutions.

Hannah Aldous 3 years, 11 months ago

Gave some feedback: Needs to be tested

Lauren Richards 3 years, 11 months ago

  • Great question but some minor changes: 
  • Remember to full stop the end of your maths in each section of the advice. 
  • Your advice doesn't match the parts. The advice has writing for a)i), ii) and iii) but there are only questions i) and ii). There is also advice for b)i), ii) and iii) and yet only one question for b). 
    a)ii) shouldn't be in the advice - that does not correspond to any question. b)ii) and b)iii) shouldn't be there either. 
  • In d), the answer for x1 and x2 were switched around in the advice. The advice is the incorrect version. 
  • Check the working for c)i), I am not sure that it is correct but it does end up with the right answer. Where does the last term from the original expression go and where do the two numbers in the penultimate line appear from? Same for c)ii). 
  • part d) - is the square of the integer in the bracket supposed to be in the form 2^2 rather than 4? Everywhere else in the question it has been in the form 4. 

Lauren Richards 3 years, 11 months ago

Gave some feedback: Has some problems

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Christian Lawson-Perfect 3 years, 11 months ago

Gave some feedback: Has some problems

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Christian Lawson-Perfect 3 years, 11 months ago

Saved a checkpoint:

Why are there three of each type of equation? Unless there's some kind of development, you should have one of each instance; the student can retry the question to get more examples.

The marking doesn't check that the student has put the expressions in the desired form. Ask Elliott about pattern-matching.

You could scale things so that only integers are used in the answer to part d. (I got $0.5 \pm \sqrt{50.25}$)

Restore this checkpoint

Hannah Aldous 3 years, 11 months ago

Gave some feedback: Needs to be tested

Elliott Fletcher 3 years, 11 months ago

Gave some feedback: Has some problems

Elliott Fletcher 3 years, 11 months ago

Main Parts

a) good

b) i) and ii) good

b) iii) I think there is an error here, i got $\simplify{x^2+29x-7}$, so i calculated the correct answer as (x+29/2)^2-869/4, however the displayed correct answer is (x+29/2)^2-71.

c) i) I think there is an error here, i got $\simplify{6x^2+36x+13}$, so i got the answer as 6(x+3)^2-41. The advice section also shows this answer, but the displayed answer 6(x+3)^2-51.

c) ii) There is an error here too, i got $\simplify{3x^2+60x-10}$, so i think the answer should be 3(x+10)^2-310, but the displayed answer is 3(x+10)^2-59.

d) good, but i would relabel the two possible answers here, as you have in the advice section as x1 and x2 (x1 being the smaller one).

Advice

I think it's fine if you don't show the working out for every question (because i know how long that would take), but i think you should say at the beginning of the advice for each part something like "We will just do one question from each part, as the other questions follow the same pattern" or "This can be similarly done for ii) and iii)".

d) I would write the numbers as fractions instead of decimals, so it's easier for the students to follow. Also, you say in the question to give the smallest answer first, so i think x1 should be the smaller number instead of x2.

Hannah Aldous 3 years, 12 months ago

Gave some feedback: Needs to be tested

Vicky Hall 3 years, 12 months ago

Gave some feedback: Has some problems

Vicky Hall 3 years, 12 months ago

In all parts of the question, put $\=$ after the expression and before the answer box.

In the advice, make sure a), b) etc are in heading 4 and that your solutions begin on the next line down. Anywhere that you reference an earlier part, write it as a) rather than a. You should write solutions for all subparts, although I agree that only subpart i) needs to go into detail. 

In part d) of the advice, make sure that when you take the square root you find $\pm$ answer, which you can do by using \pm. The last lines of this section aren't rendering so have a look at that.

When I tried part c), the solution in the advice came up with a recurring decimal, although this only happens some of the time. I'd fix this so that Numbas produces a fraction instead, which should happen if you use the \simplify command. 

Also ensure all of your equations in the advice display in the centre of the screen.

Hannah Aldous 4 years ago

Gave some feedback: Needs to be tested

Hannah Aldous 4 years ago

Created this.
Name Status Author Last Modified
Completing the square Ready to use Hannah Aldous 20/11/2019 14:34
Complete the square and find solutions Ready to use Christian Lawson-Perfect 20/11/2019 14:34
Inbbavathie's copy of Complete the square and find solutions (SP1) draft Inbbavathie Ravi 15/07/2017 22:57
Inbbavathie's copy of Complete the square and find solutions draft Inbbavathie Ravi 24/07/2017 03:48
Katherine's copy of Complete the square and find solutions draft Katherine Tomlinson 02/08/2017 12:47
Complete the square and find solutions [L4 Randomised] Needs to be tested Matthew James Sykes 25/07/2018 10:17
Ann's copy of Complete the square and find solutions draft Ann Smith 09/10/2018 12:27
Completing the square draft Adrian Jannetta 22/10/2018 08:05
Complete the square and find solutions draft Johnny Yi 02/12/2020 01:07
Simon's copy of Completing the square draft Simon Thomas 07/03/2019 10:08
Simon's copy of Complete the square and find solutions draft Simon Thomas 07/03/2019 10:10
JD's copy of Completing the square draft JD Ichwan 21/05/2019 05:37
Completing the square and finding roots of a quadratic equation draft Maria Pickett 11/09/2019 13:51
Paul's copy of Complete the square and find solutions draft Paul Verheyen 17/04/2020 12:54
F11MTC - Topic 3 - Completing the Square draft Oscar Siles Brugge 21/05/2020 16:24
Andrew's copy of Complete the square and find solutions draft Andrew McKinley 25/09/2019 13:38
claire's copy of Complete the square and find solutions draft claire lines 27/04/2020 19:46
Quadratische Ergänzung (teilweise Bruchzahlen) Ready to use Ulrich Görtz 26/11/2020 10:30
Quadratische Ergänzung (ganze Zahlen) Ready to use Ulrich Görtz 12/11/2020 12:40
Ashley's copy of Completing the square draft Ashley Cusack 16/09/2020 19:43
Adrian's copy of Completing the square draft Adrian Jannetta 23/10/2020 08:39
Quadratische Gleichung mit quadratischer Ergänzung lösen (rationale Zahlen) Ready to use Ulrich Görtz 02/12/2020 15:42
Completing the square draft steve kilgallon 05/11/2020 17:32
John's copy of Complete the square and find solutions draft John James 15/02/2021 04:43
John's copy of Complete the square and find solutions 2 draft John James 15/02/2021 05:04
Edina's copy of Completing the square draft Edina Kurdi 18/03/2021 14:39
Edina's copy of Complete the square and find solutions draft Edina Kurdi 18/03/2021 14:39
Complete the square and find solutions Ready to use Kate Henderson 27/05/2021 13:25

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