Y531/01 Mark Scheme June 2019 2. Working in part (b) is not fully correct. 3/5 if a reference to the working in part (b) is made, the same cubic equation from part (b) is written down, there is a comment stating that the roots of the new cubic are 2 2 2 , ,    and the correct follow through coefficient ratio is given. 2/5 as above but no comment about the roots of the new cubic equation being 2 2 2 , ,   or there is no reference to the working in part (b) (i.e. one element of explanation is missing). 1/5 if same cubic equation as in part (b) is written down and the correct follow through coefficient ratio is given. 3. If 13 25 appears as an answer in part (a) with no supporting working or comments then 0/5 Oxford Cambridge and RSA Examinations is a Company Limited by Guarantee Registered in England Registered Office; The Triangle Building, Shaftesbury Road, Cambridge, CB2 8EA Registered Company Number: 3484466 OCR is an exempt Charity OCR (Oxford Cambridge and RSA Examinations) Head office Telephone: 01223 552552 Facsimile: 01223 552553 © OCR 2019 OCR (Oxford Cambridge and RSA Examinations) The Triangle Building Shaftesbury Road Cambridge CB2 8EA OCR Customer Contact Centre Education and Learning Telephone: 01223 553998 Facsimile: 01223 552627 Email: general.qualifications@ocr.org.uk www.ocr.org.uk For staff training purposes and as part of our quality assurance programme your call may be recorded or monitored