Page 258 - MATHEMATICS COURSE FOR SECONDARY SCHOOLS BOOK 2

2. If P =
(a) 4P
(b) -7Q
(b) 23 Q
(d) 38 P - 23 Q
(2 -5 -1 3
and Q = )(
4 -2 15
)
, evaluate:
, calculate:
(3 -2 ) -1 4
(-4 2 ) 5 -6
) and B = ( (b) - 15 B
(c) 38 P + 23 Q
REVISION EXERCISE 12
3. If x =
(a) 13 x
4. Given that A =( determine:
and y =
(b) - 14 x
-4 ) 6
(-5 25
(a) 35 A
(c) 35 + 2/3 B
1 ) 5
829
State the elements in the first row in the
(7 calculate:
6. Given that x = 3
and Y = 2 (b) 5x – 3y
,
(-5 4) 76
9 -2
(a) 3x + 2y
8. Given that A = determine:
30 9 15
the matrix. (8 -5 0 ) 3 4 -2
(-8 4) (0 6)
7. If P =
(a) 12 P - 13 Q
-6 2
-3 1
, evaluate:
and Q =
(b) 14 P + 13 Q
-10
-6 3
,
and B = )()
State the elements in the third column in
(b)23 B (d) 35 - 23 B
State the elements in the second row of the
first column of the matrix ( 8 5 ) 37
252
9. If x =( -5 30) and y = ( 9 15 ) , find
(a) 3 x (b) 2 y 75
EXERCISE 12.2
1. (a) If A = ( 2 -4 ) and 61
(b) If B =(-1 5 73
25 -10
-6 3
)
and
k = 3, find kA. k = 2, find kb.
(c) 37 x + 25 y
10. Given that P = ( 24 -16
calculate: (a) 38 P
(d) 37 x - 25 y
8 32
and Q =
12 18
7 -1 9
State the element in the first row of the
)(
15 -30 , )
(a) 13 A
5. If A = (3 -4 )and B =
(5 8 -7) 3 0 1 .
-7 6
State the elements in the second row in the
(a) 2A + 3B
(b) 4A – 3B (-3
matrix (7 -5 4). 3 0 -1
matrix.
State the elements in the second column in
the matrix. (-5 7 2) 038
4 -1 9
6 -3 -9 0
-10 15
),
1. 2. 3.
4. 5. 6. 7. 8.
State the order of the matrix (5 1 2 ) 038
State the size the matrix
25
(-2 1 ), find 50
-5
7 -4 9.
second column of the matrix (-8 7 ) 4 -2