O-LevelMathematicsAlgebra and graphs4024/11 · Oct/Nov 2019 · Q246 Marks
A = (3 1) (-2 0) B = (-2 1) (3 0)
- (a)Evaluate 2A – B.[2]
- (b)Find A⁻¹.[2]
- (c)Find the matrix X such that AX = (3) (-4)[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.
- [2] (8 1) (-7 0)
- B1 for two or three correct elements
- [2] 1/2 (0 -1) (2 3) or (0 -1/2) (1 3/2) oe isw
- B1 for k(0 -1) (2 3) oe with k ≠ 1/2
- or for (0 -1/2) (1 3/2) oe
- [2] (2) (-3)
- B1 for one correct element in a 2 by 1 matrix
- OR
- M1 for X = A⁻¹ (3) (-4) oe
- or for (3x + y) = (3) (-2x + 0y) (-4) oe
- If 0 scored, then SC1 for (2 - 3) as final answer
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →