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Suggested answers to 2015 O level Additional Mathematics (A Maths/ Add Maths) 4047 Paper 2 Part 2/3

The equation of C = (𝒙 − 𝟓)𝟐 + (𝒚 − 𝟓)𝟐 = 𝟐𝟓

PENCILTUTOR SCHOOL PTE. LTD. Co. Reg. No. 200601708E Blk 102, #02-135 Yishun Avenue 5 Singapore 760102

Tel: 62571231 Fax: 62571921 http://www.penciltutor.com 2

PENCILTUTOR SCHOOL PTE. LTD. Co. Reg. No. 200601708E Blk 102, #02-135 Yishun Avenue 5 Singapore 760102

Tel: 62571231 Fax: 62571921 http://www.penciltutor.com 3

PENCILTUTOR SCHOOL PTE. LTD. Co. Reg. No. 200601708E Blk 102, #02-135 Yishun Avenue 5 Singapore 760102

Tel: 62571231 Fax: 62571921 http://www.penciltutor.com 4

PENCILTUTOR SCHOOL PTE. LTD. Co. Reg. No. 200601708E Blk 102, #02-135 Yishun Avenue 5 Singapore 760102

Tel: 62571231 Fax: 62571921 http://www.penciltutor.com 5

PENCILTUTOR SCHOOL PTE. LTD. Co. Reg. No. 200601708E Blk 102, #02-135 Yishun Avenue 5 Singapore 760102

Tel: 62571231 Fax: 62571921 http://www.penciltutor.com 6

Teacher’s Comment For Qn 11(i), other acceptable answers include p = 0.4 & q = 25. Then the value of x in (ii) would be x = 6.45 cm. For (iii), from the graph, other acceptable answers include x = 6.32 cm.