solve ques no. 18 -3
IS.
If
5
x
16.
18
4
2
x
SPECTRUM MA
. then positive value of x is
8
, then x is equal to
18 6
, then x is equal to
(d)
x
(ii) If
9
x
(iii) If
12
a
2
3
a
4.
10. (ay
12. (i)
4
3
x
2
a
-2
a
12 6
. then x is equal to
and IA13 = 125, thena equals •
and IA 13
and I A1
— — 125, then a equals :
3 125, thena equals :
inant of 3
symbol '12
arranged in
b' • C' are
inant of a
inant of a matri
ond order determinant
of sec
(or column). There are
each of three rows (RI, R2
value as shown below.
Consider the determina
IAI-
Expansion along first
Step 1 : Multiply first
end with the second order de
first column (CD of i I
i.e.
(-1)1+1
(P.B. 20111
ANSWERS
2. 18
-6,6
3.
6.
9.
15.
2
(c) is correct
Step 2 : Multiply 2nd
with the second order
-nd2nd column (C2) of A
(-1)1+2
Step 3 : Multiply 3rc
With the second order
d 3rd column (C,) of I
14. (c) is correct
(ii) (b) is correctanswer ajD
i.e.
(-1)1+
16. (i) (b) is correct answer
17. (c) is correct
