IB Questionbank Mathematical Studies 3rd edition. Quadratics. 112 min 110 marks. y l
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1 IB Questionbank Mathematical Studies 3rd edition Quadratics 112 min 110 marks 1. The following diagram shows a straight line l y l (a) Find the equation of the line l. The line n is parallel to l and passes through the point (0, 8). Write down the equation of the line n. The line n crosses the horizontal ais at the point P. Find the coordinates of P. (Total 4 marks)
2 2. The line L 1 shown on the set of aes below has equation 3 + 4y = 24. L 1 cuts the -ais at A and cuts the y-ais at B. Diagram not drawn to scale y L 1 B L 2 M O C A (a) Write down the coordinates of A and B. M is the midpoint of the line segment [AB]. Write down the coordinates of M. The line L 2 passes through the point M and the point C (0, 2). Write down the equation of L 2. (d) Find the length of (i) (ii) MC; AC.
3 (e) The length of AM is 5. Find (i) the size of angle CMA; (3) (ii) the area of the triangle with vertices C, M and A. (Total 15 marks) 3. (a) Represent the function y = 2 2 5, where { 2, 1, 0, 1, 2, 3} by a mapping diagram. y List the elements of the domain of this function. List the elements of the range of this function.
4 4. The graph of the function y = 2 2 is drawn below. y A 0 B C (a) Write down the coordinates of the point C. Calculate the coordinates of the points A and B. (Total 8 marks)
5 5. The diagram shows the graph of y = The graph crosses the -ais at the point A, and has a verte at B. y A O B (a) Factorize Write down the coordinates of each of these points (i) A; (ii) B. (Total 4 marks) 6. (a) Sketch the graph of the function y = Write down the coordinates of the local maimum or minimum of the function. Find the equation of the ais of symmetry of the function. 7. (a) Solve the equation = 0. Find the coordinates of the points where the graph of y = intersects the -ais. (Total 4 marks)
6 8. Let f() = (a) Factorise Hence, or otherwise, solve the equation = 0. Let g() = + 3. Write down the solutions to the equation f() = g(). 9. A quadratic curve with equation y = a( b) is shown in the following diagram. The -intercepts are at (0, 0) and (6, 0), and the verte V is at (h, 8). (a) Find the value of h. Find the equation of the curve. (4)
7 10. The following is the graph of the quadratic function y = f(). (a) Write down the solutions to the equation f() = 0. Write down the equation of the ais of symmetry of the graph of f(). The equation f() = 12 has two solutions. One of these solutions is = 6. Use the symmetry of the graph to find the other solution. (d) The minimum value for y is 4. Write down the range of f().
8 11. The graph of y = 2 2 r + q is shown for 5 7. The graph cuts the y-ais at (0, 4). (a) Write down the value of q. The ais of symmetry is = 2.5. Find the value of r. Write down the minimum value of y. (d) Write down the range of y.
9 12. Two functions are defined as follows f () = 6 for 0 < 6 6 for 6 g () = 1 2 (a) Draw the graphs of the functions f and g in the interval 0 14, 0 y 8 using a scale of 1 cm to represent 1 unit on both aes. (5) (i) Mark the intersection points A and B of f () and g () on the graph. (ii) Write down the coordinates of A and B. (3) Calculate the midpoint M of the line AB. (d) Find the equation of the straight line which joins the points M and N. (4) (Total 14 marks)
10 13. The perimeter of this rectangular field is 220 m. One side is m as shown. W m (a) Epress the width (W) in terms of. m Write an epression, in terms of only, for the area of the field. If the length () is 70 m, find the area. (Total 4 marks) 14. (a) Factorise the epression 2 k. Hence solve the equation 2 k = 0. The diagram below shows the graph of the function f() = 2 k for a particular value of k. Write down the value of k for this function.
11 (d) Find the minimum value of the function y = f(). (3) 15. The profit (P) in Swiss Francs made by three students selling homemade lemonade is modelled by the function 1 P = where is the number of glasses of lemonade sold. (a) Copy and complete the table below P (3) On graph paper draw aes for and P, placing on the horizontal ais and P on the vertical ais. Use suitable scales. Draw the graph of P against by plotting the points. Label your graph. (5) Use your graph to find (i) (ii) (iii) (iv) the maimum possible profit; the number of glasses that need to be sold to make the maimum profit; the number of glasses that need to be sold to make a profit of 80 Swiss Francs; the amount of money initially invested by the three students. (d) The three students Baljeet, Jane and Fiona share the profits in the ratio of 1:2:3 respectively. If they sold 40 glasses of lemonade, calculate Fiona s share of the profits. (Total 15 marks)
(c) Find the gradient of the graph of f(x) at the point where x = 1. (2) The graph of f(x) has a local maximum point, M, and a local minimum point, N.
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