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Asked by AmbassadorFlagRaven22
. (a) The student has made a mistake in both parts of their...
Image transcription text Question 3 — 15 marks
This question is based on your work on MU125' up to and including Unit 5. In this question, you are asked to comment on a student's incorrect attempt
at answering the question detailed below. Image transcription text The question
(i) Simplify the following expression as far as possible, showing all your
working:
9y - 14 - 3y + 50.
(ii) Solve the following equation, showing all your working:
g ( t - 4 ) = 12.
The student's incorrect attempt:
(i )
Given:
9y- 14 - 3y +50
Group like terms:
= 9y - 3y - 14+50
Collect like terms:
= by + 36
SUBtract 36:
- 36 = by
Divide By 6:
- b=y
The solution is y = -b.
(ii )
Given :
(t - 4 ) = 12
Clear the fraction:
3 (t - 32 ) = 96
Multiply By 3:
3t - 96 = 96
Add 96:
3t = 192
Divide By 3:
The solution is t = 64. Image transcription text (a) The student has made a mistake in both parts of their attempt. Identify these mistakes and explain, as if directly to the student, why,
for each mistake, their reasoning is incorrect. (b) Write out your own solution to each part of the question, explaining
your working. Image transcription text (c) The student decides to check if the solution they got to part (ii) of the
question was correct using the following approach:
Check:
3
Substitute but for t:
(64 - 4 )= 12
8
W
Work out the Brackets:
(60 ) = 12
45
GivinG:
2
= 12
This is incorrect so the solution t = 64 is incorrect
(1) Explain why the approach to checking that they have chosen is
incorrect.
[2]
(2) Show how the student should have performed the check.
Solved by verified expert
Answered by APPHYC
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