ACSI 2017 Y3EXP FYE AMath P2

Anglo-Chinese School (Independent) FINAL EXAMINATION 2017 YEAR THREE EXPRESS ADDITIONAL MATHEMATICS PAPER 2 Wednesday 11 October 2017 1 hour 30 minutes Additional Materials: Answer Paper (8 sheets) Graph Paper (1 sheet) READ THESE INSTRUCTIONS FIRST Write your index number on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions. Write your answers on the separate Answer Paper provided. Give non-exact numerical answers correct to 3 significant figures, or 1 decimal place in the case of angles in degrees, unless a different level of accuracy is specified in the question. The use of a scientific calculator is expected, where appropriate. You are reminded of the need for clear presentation in your answers. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 60. _______________________________________________________________ This quest This question paper consists of 5 printed pages. [Turn over…

ACS(Independent)MathDept/Y3AddMathP2/2017/FinalExam 2 Mathematical Formulae ALGEBRA Quadratic Equation For the equation 02 =++ cbxax , a acbbx 2 42 −±−= Binomial expansion ( ) 1 22 ... ... ,12 n n n n nr r nnn nab a ab a b a b b r −− −  + = + + ++ ++     where n is a positive integer and ( ) ! ( 1)...( 1) !! ! n r n nn n rC rnr r − −+= = − . TRIGONOMETRY Identities 1cossin 22 =+ AA AA 22 tan1sec += AAec 22 cot1cos += Formulae for ∆ABC C c B b A a sinsinsin == Abccba cos2222 −+= 1 sin2 ab C∆=

ACS(Independent)MathDept/Y3AddMathP2/2017/FinalExam 3 1. Solve the equation ( )x x 224 4 = . [3] 2. The roots of the equation ( ) 232 −−= xkx , are 1+α and 4+α where k > 0. Find the value of k in the form ba+ . [4] 3. Express ( )( ) 2 2 132 7 −+ +−− xx xx in partial fractions. [4] 4. A metallic sphere is heated to a temperature of 287oC and left to cool in an air conditioned room. As the sphere cools, its temperature, ToC, t mins after it is left in the room is given by kteT −+= 26522 , where k is a constant. When t = 5, the temperature of the sphere reaches 200oC. (i) Find the value