Q Scheme Marks AOs Pearson ( ) 2. Notes. Deduces that 21a 168 = 0 and solves to find a = 8 A1* 2.2a
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1 Further Maths Core Pure (AS/Year 1) Unit Test : Matrices Q Scheme Marks AOs Pearson Finds det M = 3 p p+ 4 = p + 4 p+ 6 1 ( )( ) ( )( ) ( ) Completes the square to show p + 4p+ 6= p+ + M1.a Concludes that (p + ) + > 0 for all values of p. Therefore det M 0 and M is non-singular. B1 3.a (3 marks) Finds a a a + b a = = b 8 b 8 ab 8b 1b + 64 Deduces that 1a 168 = 0 and solves to find a = 8 A1*.a Deduces that a + 1b = 1 and solves to find b = 3 A1*.a (3 marks) Can use any of the following equations to find a and b. Award 1 mark for finding a and 1 mark for finding b. a + 1b = 1 1a 168 = 0 ab 8b = 0 1b + 64 = 1 Pearson Education Ltd 017. Copying permitted for purchasing institution only. This material is not copyright free. 1
2 Further Maths Core Pure (AS/Year 1) Unit Test : Matrices 3a States either cos θ = or sin θ = or tanθ = 3 Finds θ = 150 and concludes this is a rotation of 150 anticlockwise about the origin. B1 3.a () 3b Sets up a matrix equation of the form: two separate equations of the form and or M1 1.1a Finds or 3 1 and States P, and Q, A1 3.a (3) Pearson Education Ltd 017. Copying permitted for purchasing institution only. This material is not copyright free.
3 Further Maths Core Pure (AS/Year 1) Unit Test : Matrices 3c Finds M 1 3 = States either cos θ = or sin θ = or tanθ = 3 Finds θ = 300 and concludes this is a rotation of 300 anticlockwise about the origin. or Finds θ = 60 and concludes that it is a rotation of 60 clockwise about the orgin. B1 3.a (3) (8 marks) Pearson Education Ltd 017. Copying permitted for purchasing institution only. This material is not copyright free. 3
4 Further Maths Core Pure (AS/Year 1) Unit Test : Matrices 4a Reflection in the line y = x B1 3.a (1) 4b Calculates 0 1 a b = 1 0 b a States or implies b = 4 + a and b = 4 + a = 5 + b M1.a Finds a = 1 and b = 6 A1 1.1b (3) (4 marks) Pearson Education Ltd 017. Copying permitted for purchasing institution only. This material is not copyright free. 4
5 Further Maths Core Pure (AS/Year 1) Unit Test : Matrices 5 Finds 0 q + 5 q P = States that this is an enlargement. A1 3.a States scale factor is q + 5 and centre is (0, 0). A1 3.a (3 marks) Pearson Education Ltd 017. Copying permitted for purchasing institution only. This material is not copyright free. 5
6 Further Maths Core Pure (AS/Year 1) Unit Test : Matrices 6a Writes the matrix representing a reflection in the plane y = 0: B1 3.1a 6b Finds the midpoint of the line segment = (5, 5, 9) (1) a Makes an attempt to calculate = b c Minimum required is setting up the calculation. M1.a Correctly finds the coordinates (5, 5, 9) A1 3.1b 6c States or implies that N is the inverse of M. M1.a (3) Finds N=M = A1 1.1b () (6 marks) Pearson Education Ltd 017. Copying permitted for purchasing institution only. This material is not copyright free. 6
7 Further Maths Core Pure (AS/Year 1) Unit Test : Matrices 7a det ( ) = ( 1)( 1) ( )( ) M M1 1.1a M is non-singular because det (M) = 3 and so det (M) 0 A1.4 () 7b Area (S) = 3 0 = 60 B1 ft 1. (1) 7c Shows k = det ( ) = ( 1)( 1) ( )( ) M 7d States k = 3 A1 ft 1.1b 1 States cos θ = or sin θ = or tanθ = 3 3 θ = 15.3 Accept answers which round to 15.3 A1 1.1b () () (7 marks) Pearson Education Ltd 017. Copying permitted for purchasing institution only. This material is not copyright free. 7
8 Further Maths Core Pure (AS/Year 1) Unit Test : Matrices 8a 1 3 States either cos θ = or sin θ = or tanθ = 3 Finds θ = 40 and concludes this is a rotation of 40 anticlockwise about the z-axis. B1 3.a () 8b Makes an attempt to calculate p p Minimum required is setting up the calculation. Correctly finds p p p = p p A1 1.1b () (4 marks) Pearson Education Ltd 017. Copying permitted for purchasing institution only. This material is not copyright free. 8
9 Further Maths Core Pure (AS/Year 1) Unit Test : Matrices 9 Attempts to set up three equations with three unknowns. M1 3.1b At least two equations are correct, with variables defined. x = area of residential land y = area of commercial land z = area of recreational land x+ y+ z= 00 y+ z= 0 1.x+ 0.9y+ 1.8z= 40 A1 1.1b Sets up a matrix equation of the form, where are numerical values x y =..., z... M1 3.1a States the correct matrix equation: x y = z 40 A1 1.1b Attempts to use an inverse matrix to find the values of x, y and z. 1 x y = z Finds the correct answers for x, y and z: x 140 y = 0 z 40 A1 1.1b Puts their answer into context. In 001, there were 140 square kilometres assigned to residential, 0 square kilometres assigned to commerical and 40 square kilometres assigned to recreation. A1 ft 3.a (7 marks) 9 Note the inverse matrix of is Pearson Education Ltd 017. Copying permitted for purchasing institution only. This material is not copyright free. 9
10 Further Maths Core Pure (AS/Year 1) Unit Test : Matrices 10a States either cosθ = 1 1 orsinθ = or tanθ = 1 Finds θ = 135 and concludes this is a rotation of 135 anticlockwise about the origin. or Finds θ = 45 and concludes this is a rotation of 45 clockwise about the origin. B1 3.a () 10b Finds M = 1 1 a a 1 States or implies that if M = then = M b 3 b 3 M1 3.1a Correctly solves to find a = 4 and b = A1 1.1b (3) (5 marks) Pearson Education Ltd 017. Copying permitted for purchasing institution only. This material is not copyright free. 10
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