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If A=[(x,-2),(3,7)] and A^(-1)=[(7/34,1/...

If `A=[(x,-2),(3,7)]` and `A^(-1)=[(7/34,1/17),((-3)/34,2/17)]`,then the value of x is

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The correct Answer is:
`x=4`
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CBSE COMPLEMENTARY MATERIAL-MATRICES AND DETERMINANTS-FOUR MARK QUESTIONS
  1. If A=|1 2 2 2 1 2 2 2 1|, verifty that A^2-4A-5I=0

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  2. Using elementary transformations find the inverse of the matrix A=[(...

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  3. If A=[(x,-2),(3,7)] and A^(-1)=[(7/34,1/17),((-3)/34,2/17)],then the v...

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  4. If A=[(2,-3),(0,1)], find B, such that 4A^(-1)+B=A^(2)

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  5. Let A =[(1,-1,1),(2,1,-3),(1,1,1)] and 10B=[(4,2,2),(-5,0,alpha),(...

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  6. Find A^2-5A+6I , if A=[2 0 1 2 1 3 1-1 0]

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  7. If A=[(1,-2,3),(0,-1,4),(-2,2,1)], find (A')^(-1)

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  8. The monthly incomes of Aryan and Babban are in the ratio 3 : 4 and ...

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  9. If A=[{:(0,-1,2),(4,3,-4):}] and B=[{:(4,0),(1,3),(2,6):}] then verify...

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  10. If A=[{:( 0,-x),(x,0):}].B[{:(0,1),(1,0):}] and x^(2)=-1 , then show ...

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  11. Prove that aI+bA+cA^(2)=A^(3), if A=[(0,1,0),(0,0,1),(a,b,c)]

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  12. If A=[[cos 2 theta, sin 2 theta],[-sin2theta, cos2theta]], find A^2

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  13. If A=[(1,-1),(2,1)], B=[(a,1),(b,-1)] and (A+B)^(2)=A^(2)+B^(2)+2AB, t...

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  14. If A=[(0,2b,c),(a,b,-c),(a,-b,c)], then find the value of a, b and c. ...

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  15. If A=[[a,b],[0,1]] then prove that A^n=[[a^n,(b(a^n-1))/(a-1)],[0,1]]

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  16. Find the value of k, if: |(a+b,b+c,c+a),(b+c,c+a,a+b),(c+a,a+b,b+c)|=k...

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  17. If x,y and zinR, and Delta=|(x,x+y,x+y+z),(2x,5x+2y,7x+5y+2z),(3x,7x...

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  18. If |(1,a^2,a^4),(1,b^2,b^4),(1,c^2,c^4)|=k|(1,1,1),(a,b,c),(a^2,b^2,c^...

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  19. Evaluate the following: |[1,,a^2-bc],[1, b,b^2-ac],[1,c,c^2-ab]|

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  20. |(1,a^(2)+bc,a^(3)),(1,b^(2)+ac,b^(3)),(1,c^(2)+ab,c^(3))|=-(a-b)(b-c)...

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