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If A = [{:(1,2),(-2,3):}], B= [{:(2,1),(...

If `A = [{:(1,2),(-2,3):}], B= [{:(2,1),(2,3):}] and C = [{:(-3,1),(2,0):}]`,verify that (AB)C = A(BC) and A(B+C)=AB+AC.

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we have, AB `AB = [{:(1,2),(-2,3):}],xx [{:(2,1),(2,3):}]`
`=[{:(1.2+2.2,1.1+2.3),((-2).2+3.2,(-2).1+3.3):}]=[{:(6,7),(2,7):}]`
`BC =[{:(2,1),(2,3):}]xx[{:(-3,1),(2,0):}]=[{:(2*(-3)+1.2,2.1+1.0),(2*(-3)+3.2,2.1+3.0):}]`
`=[{:(-6+2,2+0),(-6+6,2+0):}]=[{:(-4,2),(0,2):}]`
`BC =[{:(2,1),(-2,3):}]xx[{:(-3,1),(2,0):}]=[{:(1*(-3)+2.2,,1.1+2.0),((-2)*(-3)+3.2,,(-2)1+3.0):}]`
`=[{:(-3+4,1+0),(6+6,-2+0):}]=[{:(1,1),(12,-2):}]` ltbegt `B+C =[{:(2,1),(2,3):}]+[{:(-3,1),(2,0):}]=[{:(2-3,1+1),(2+2,3+0):}]=[{:(-1,2),(4,3):}]`
Now, (AB)C `[{:(6,7),(2,3):}]xx[{:(-3,1),(2,0):}]=[{:(-18-3,6+0),(-6+14,2+0):}]`
`=[{:(-4,6),(8,2):}]`
A(BC)` =[{:(1,2),(-2,3):}]xx[{:(-4,2),(0,2):}]`
`=[{:(-4+0,2+4),(8+0,-4+6):}]=[{:(-4,2),(8,2):}]`
Thus, from Eqs. (i) and (ii), we get, (AB)C =A(BC)
Now, A(B+C) `=[{:(1,2),(-2,3):}]xx[{:(-1,2),(4,3):}]=[{:(-1+8,2+6),(2+12,-4+9):}]`
`=[{:(7,8),(14,5):}]`and AB+AC `=[{:(6,7),(2,7):}]xx[{:(1,1),(12,-2):}]=[{:(6+1,7+1),(2+12,7-2):}]`
`=[{:(7,8),(14,5):}]`
Thus, from Eqs, (iii) and (iv), we get
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ARIHANT MATHS-MATRICES -Exercise (Questions Asked In Previous 13 Years Exam)
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  4. If A=[(1,0),(1,1)] and I=[(1,0),(0,1)] then which one of the following...

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  5. If A^(2)-A+I=O, then A^(-1) is equal to

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  6. Let {:A=[(1,0,0),(2,1,0),(3,2,1)]:}and U1,U2,U3 be column matrices sat...

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  7. Let A = [(1,0,0), (2,1,0), (3,2,1)], and U1, U2 and U3 are columns of ...

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  8. If A= ((1,0,0),(2,1,0),(3,2,1)), U(1), U(2), and U(3) are column matri...

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  11. Let A= [[5,5alpha,alpha],[0,alpha,5alpha],[0,0,5]] . If |A^2|...

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  12. Let A and B be 3xx3 matrtices of real numbers, where A is symmetric, "...

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  13. Let A be a square matrix all of whose entries are integers. Then wh...

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  14. Let A be a 2xx2 matrix with real entries. Let I be the 2xx2 identi...

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  15. Let A be the set of all 3xx3 symmetric matrices all of whose either 0 ...

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  16. Let A be the set of all 3xx3 symmetric matrices all of whose either 0 ...

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  18. Let A be a 2xx2 matrix Statement -1 adj (adjA)=A Statement-2 abs(a...

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