Error Analysis -(Bryan Goh)

Diagnostic Test 2:

Question 4(c):

QD:
Line 1: (Careless)

2(11-9) = (2x2)
       not: (2x3)

Line 2: ) (Conceptual)

(-1/2 x -1/2) = +1/4
              not: -1

QE:
Line 1: (Conceptual)

(1/2)^2 = +1/4
       not: (-0.25)
Note: (-) x (-) = (+)

QF:
Line 2: (Conceptual)

16(-1/2)^2 = 16(1/4)
                  =4
            not:(16 x -1/2)^2 = 8


Question 4 (d):

QA:
Line 2: (Conceptual)

Should be: -1/2
                 --------
                   1/6

QB:
Line 3: (Conceptual)

-1/2
------ = -1/2 x 6
 1/6
        = 3

QC:
Line 1: (Careless)

1/2 - 1 is not 1/2 + 1
 (-1/2)            (1.5)

2/3 x 1/4 = 1/6

QD:
Line 4: (Conceptual)

(-1/2)
------- = (-1/2) x 6/1
  1/6
    not: (-2/1) x 1/6

QE:
Line 1: (Conceptual)

2/3 x 1/4 is not 2/3
                       ------
                        4/1