- #1
bobbricks
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Please see question 9ii:
Paper: http://www.edexcel.com/migrationdoc...00/January 2012 - QP/6664_01_que_20120307.pdf
Mark scheme: http://www.edexcel.com/migrationdoc...00/January 2012 - MS/6664_01_msc_20120123.pdf
This is my working:
First I drew the sine graph, and then worked out that P had been translated/stretched from co ordinates (0,0) to (pi/10,0), Q from (pi,0) to (3pi/10,0) and R from (2pi,0) to (11pi,0).
Let m=ax-b
Sub x=0, m=pi/10 (where 0 is the x co ordinate before and pi/10 is the co ordinate after) so pi/10=-b so b=pi/10.
Sub x=pi, m=3pi/5 so 3pi/5=pi*a so a=1/2
Hence, y=sin(0.5x+pi/10) which seems to work for R as well--is this all incorrect and why?
Paper: http://www.edexcel.com/migrationdoc...00/January 2012 - QP/6664_01_que_20120307.pdf
Mark scheme: http://www.edexcel.com/migrationdoc...00/January 2012 - MS/6664_01_msc_20120123.pdf
This is my working:
First I drew the sine graph, and then worked out that P had been translated/stretched from co ordinates (0,0) to (pi/10,0), Q from (pi,0) to (3pi/10,0) and R from (2pi,0) to (11pi,0).
Let m=ax-b
Sub x=0, m=pi/10 (where 0 is the x co ordinate before and pi/10 is the co ordinate after) so pi/10=-b so b=pi/10.
Sub x=pi, m=3pi/5 so 3pi/5=pi*a so a=1/2
Hence, y=sin(0.5x+pi/10) which seems to work for R as well--is this all incorrect and why?