Class XII Mathematics
Important Questions Set for Day-4
2 -3 5
1
If A= 3 2 -4 , tl1er1 fir1d A- .
I I -2
1
Using A- solve the following syste1n of equation
,
2x-3y+5z = 11
3x+2y-4z =-5
x+ y-2z = 3 -
Ans,ver:
Al=2(0)+ 3(-2) + 5(1) =-1
0 -1 2 1 -2
0
⇒ A-1 =- 2 -9 23 or -2 9 -23
1 -5 13 -1 5 -13
Given equations can be vvritten as AX= B, wl1ere X
0 1 -2 11 1
.-. X=A-1B = -2 9 -23 -5 -
- 2
-1 5 -13 -_)
�
3
,
,
,
Important Questions Set for Day-4
2 -3 5
1
If A= 3 2 -4 , tl1er1 fir1d A- .
I I -2
1
Using A- solve the following syste1n of equation
,
2x-3y+5z = 11
3x+2y-4z =-5
x+ y-2z = 3 -
Ans,ver:
Al=2(0)+ 3(-2) + 5(1) =-1
0 -1 2 1 -2
0
⇒ A-1 =- 2 -9 23 or -2 9 -23
1 -5 13 -1 5 -13
Given equations can be vvritten as AX= B, wl1ere X
0 1 -2 11 1
.-. X=A-1B = -2 9 -23 -5 -
- 2
-1 5 -13 -_)
�
3
,
,
,
