Home
Class 12
MATHS
compute the indicated products . (i) [...

compute the indicated products . `(i) [{:(a,b),(-b,a):}][{:(a,-b),(b,a):}](ii) [{:(1),(2),(3):}][2" "3 " "4 ]` `(iii) [{:(1,-2),(2,3):}][{:(1,2,3),(2,3,1):}]` `(iv)[{:(2,3,4),(3,4,5),(4,5,6):}][{:(1,-3,5),(0,2,4),(3,0,5):}]` (V)`[{:(2,1),(3,2),(-1,1):}][{:(1,0,1),(-1,2,1):}]` (vi) `[{:(3,-1,3),(-1,0,2):}][{:(2,-3),(1,0),(3,1):}]`

Text Solution

Verified by Experts

The correct Answer is:
N/a

`[{:(a,b),(a,-b):}][{:(a,-b),(b,a):}]=[{:(a^(2)+b^(2),-2ab+ba),(-ab+ab,b^(2)+a^(2)):}]`
`(ii) [{:(a^(2)+b^(2),0),(0,a^(2)+b^(2)):}]`
`(ii) [{:(1),(2),(3):}][2" "3" "4]=[{:(2,3,4),(4,6,8),(6,9,12):}]`
`(iii) [{:(1,-2),(2,3):}][{:(1,2,3),(2,3,1):}]=[{:(1-4,2-6,3-2),(2+6,4+9,6+3):}]`
`=[{:(-3,-4,1),(8,13,9):}]`
`(iv) [{:(2,3,4),(3,4,5),(4,5,6):}][{:(1,-3,-5),(0,2,4),(3,0,5):}]`
`=[{:(2+0+12,-6+6+0,10+12+20),(3+0+15,-9+8+0,15+16+25),(4+0+18,-12+10+0,20+20+30):}]`
`=[{:(14,0,42),(18,-1,56),(22,-2,70):}]`
`(v) [{:(2,1),(3,2),(-1,1):][{:(1,0,1),(-1,2,1):}]=[{:(2-1,0+2,2+1),(3-2,0+4,3+2),(-1-1,0+2,-1+1):}]`
`=[{:(1,2,3),(1,4,5),(-2,2,0):}]`
`(vi)[{:(3,-1,3),(-1,0,2):}][{:(2,-3),(1,0),(3,1):}]`
`=[{:(6-1+9,-9+0+3),(-2+0+6,3+0+2):}]=[{:(14,-6),(4,5):}]`
Promotional Banner

Topper's Solved these Questions

  • MATRICES

    NAGEEN PRAKASHAN|Exercise Exercise 3.3|12 Videos
  • MATRICES

    NAGEEN PRAKASHAN|Exercise Exercise 3.4|18 Videos
  • MATRICES

    NAGEEN PRAKASHAN|Exercise Exercise 3.1|10 Videos
  • LINEAR PROGRAMMING

    NAGEEN PRAKASHAN|Exercise Miscellaneous Exercise|9 Videos
  • PROBABIILITY

    NAGEEN PRAKASHAN|Exercise Miscellaneous Exercise|19 Videos

Similar Questions

Explore conceptually related problems

Compute the indicated products (i) [(a,b),(-b,a)][(a,-b),(b,a)] (ii) [(1),(2),(3)]["2 3 4"] (iii) [(1,-2),(2,3)][(1,2,3),(2,3,1)] (iv) [(3,-1,3),(-1,0,2)][(2,-3),(1,0),(3,1)] .

show that (i) [{:(5,-1),(6,7):}][{:(2,3),(3,4):}]ne[{:(2,3),(3,4):}][{:(5,-1),(6,7):}] (ii) [{:(1,2,3),(0,1,0),(1,1,0):}][{:(-1,1,0),(0,-1,1),(2,3,4):}] ne[{:(-1,1,0),(0,-1,1),(2,3,4):}][{:(1,2,3),(0,1,0),(1,1,0):}]

Find the inverse of the following matrices if exist : (i) |{:(5,-3),(2,2):}| (ii) |{:(1,-3),(-1,2):}| (iii) |{:(1,0,-1),(3,4,5),(0,-6,-7):}| (iv) |{:(1,-3,3),(2,2,-4),(2,0,2):}| (v) |{:(1,2,1),(1,-1,-2),(1,2,-1):}| (vi) |{:(4,-2,-1),(1,1,-1),(-1,2,4):}|

If A=[{:(,1),(,2),(,3):}]and B =[{:(,-5,4,0),(,0,2,-1),(,1,-3,2):}]"then"

Compute AB and BA, whichever exists when (i) A=[{:(2,-1),(3," "0),(-1," "4):}]" and "B=[{:(-2,3),(0,4):}] (ii) A=[{:(-1,1),(-2,2),(-3,3):}]" and "B=[{:(" "3,-2," "1),(" "0," "1," "2),(-3," "4,-5):}] (iii) A=[{:(0,1,-5),(2,4," "0):}]" and "B=[{:(1,3),(-1,0),(0,5):}] (iv) A=[1" "2" "3" "4]" and "B=[{:(1),(2),(3),(4):}] (v) A=[{:(2,1),(3,2),(-1,1):}]" and "B=[{:(1,0,1),(-1,2,1):}]

Verify that A(B+C)=(AB+AC), when (i) A=[{:(1,2),(3,4):}],B=[{:(2," "0),(1,-3):}]" and "C=[{:(1,-1),(0," "1):}]. (ii) A=[{:(2,3),(-1,4),(0,1):}],B=[{:(5,-3),(2," "1):}]" and "C=[{:(-1,2),(" "3,4):}].

Given A=[{:(5,0,4),(2,3,2),(1,2,1):}] , B^(-1)=[{:(1,2,3),(1,4,3),(1,3,4):}] . Compute (AB)^(-1) .

Show that (i) [(5,-1),(6,7)][(2,1),(3,4)]!=[(2,1),(3,4)][(5,-1),(6,7)] (ii) [(1,2,3),(0,1,0),(1,1,1)][(-1,1,0),(0,-1,1),(2,3,4)]!=[(-1,1,0),(0,-1,1),(2,3,4)][(1,2,3),(0,1,0),(1,1,0)] .

Find AB and BA if exists from the following matrices A and B: (i) A=[{:(2,3,-1),(0,1,2):}]and B=[{:(2,-6),(-4,0):}] (ii) A=[{:(1,2,3),(0,1,-2),(-1,0,-1):}]and B=[{:(0,0,2),(2,0,0),(0,2,0):}] (iii) A=[{:(0,3,4),(2,1,-2),(1,-3,-1):}]and B=[{:(2,1,3),(-1,0,-2):}]

NAGEEN PRAKASHAN-MATRICES-Exercise 3.2
  1. A=[{:(2,4),(3,2):}],B=[{:(1,3),(-2,5):}],C=[{:(-2,5),(3,4):}] find ...

    Text Solution

    |

  2. compute the following : (i) [{:(a,b),(-b,a):}]+[{:(a,b),(b,a):}] (...

    Text Solution

    |

  3. compute the indicated products . (i) [{:(a,b),(-b,a):}][{:(a,-b),(b,...

    Text Solution

    |

  4. if A=[{:(1,2,-3),(5,0,2),(1,-1,1):}],B=[{:(3,-1,2),(4,2,5),(2,0,3):}]a...

    Text Solution

    |

  5. If A=[2/3 1 5/3 1/3 2/3 4/3 7/3 2 2/3] and B=[2/3 2/5 1 1/5 2/5 4/5 7/...

    Text Solution

    |

  6. Simplify: cos theta[{:(costheta,sintheta),(-sintheta,costheta):}]+si...

    Text Solution

    |

  7. Find X and Y, if(i) X+Y=[7 0 2 5]and X-Y=[3 0 0 3](ii) 2X+3Y=[2 3 4 0]...

    Text Solution

    |

  8. Find X if Y=[3 2 1 4] and 2X+Y=[1 0-3 2] .

    Text Solution

    |

  9. Find X and Y,if 2[{:(1,3),(0,x):}]+[{:(y,0),(1,2):}]=[{:(5,6),(1,8...

    Text Solution

    |

  10. Solve the equation for x, y, z and t, if 2[x z y t]+3[1-1 0 2]=3[3 5 4...

    Text Solution

    |

  11. ifx[{:(2),(3):}]+y[{:(-1),(1):}]=[{:(10),(5):}],find the values of x ...

    Text Solution

    |

  12. Given 3[x y z w]-[x6-1 2w]+[4x+y z+w3] , find the values of x, y, z an...

    Text Solution

    |

  13. If f(x) = [(cos x , - sinx,0),(sinx,cosx,0),(0,0,1)] then show f(x) . ...

    Text Solution

    |

  14. show that (i) [{:(5,-1),(6,7):}][{:(2,3),(3,4):}]ne[{:(2,3),(3,4):}]...

    Text Solution

    |

  15. If f(x)=x^2-5x+6. Find f(A),if A=[(2,0,1),(2,1,3),(1,-1,0)].

    Text Solution

    |

  16. If A=[1 0 2 0 2 1 2 0 3] , prove that A^3-6A^2+7A+2I=0

    Text Solution

    |

  17. If A A=[3-2 4-2]and I=[1 0 0 1], find k so that A^2=k A-2I.

    Text Solution

    |

  18. Let A=[0-tan(alpha//2)tan(alpha//2)0] and I be the identity matrix ...

    Text Solution

    |

  19. A trust fund has Rs. 30000 that must be invested in two different t...

    Text Solution

    |

  20. The bookshop of a particular school has 10 dozen chemistry books, 8...

    Text Solution

    |