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Theory of Equations Model Question Paper

12th Standard

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Maths

Time : 02:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. A zero of x3 + 64 is

    (a)

    0

    (b)

    4

    (c)

    4i

    (d)

    -4

  2. The number of real numbers in [0, 2π] satisfying sin4x - 2sin2x + 1 is

    (a)

    2

    (b)

    4

    (c)

    1

    (d)

  3. The number of positive zeros of the polynomial \(\overset { n }{ \underset { j=0 }{ \Sigma } } { n }_{ C_{ r } }\)(-1)rxr is

    (a)

    0

    (b)

    n

    (c)

    < n

    (d)

    r

  4. For real x, the equation \(\left| \frac { x }{ x-1 } \right| +|x|=\frac { { x }^{ 2 } }{ |x-1| } \) has ________

    (a)

    one solution

    (b)

    two solution

    (c)

    at least two solution

    (d)

    no solution

  5. If x2 - hx - 21 = 0 and x2 - 3hx + 35 = 0 (h > 0) have a common root, then h = ___________

    (a)

    0

    (b)

    1

    (c)

    4

    (d)

    3

  6. 5 x 1 = 5
  7. p(x) = xn.p\(\left( \frac { 1 }{ x } \right) \)

  8. (1)

    Reciprocal equation of type I

  9. 2x7-3x6-4x5+5x4+6x3-7x+8 = 0

  10. (2)

    no positive and no negative root

  11. x9+9x7+3x+7x5+5x3

  12. (3)

    Type I even degree reciprocal equation

  13. x3-3x2 -33x +35 = 0

  14. (4)

    4 Change of sign

  15. x4 - 10x3 + 26x2 - 10x + 1= 0

  16. (5)

    zero sum of all co-efficients

    5 x 2 = 10
  17. If α, β, and γ are the roots of the equation x+ px+ qx + r = 0, find the value of  \(\Sigma \frac { 1 }{ \beta \gamma } \) in terms of the coefficients.

  18. Find the monic polynomial equation of minimum degree with real coefficients having 2 -\(\sqrt{3}\)i as a root.

  19. If x2+2(k+2)x+9k = 0 has equal roots, find k.

  20. Solve the equation : x4-14x+ 45 = 0

  21. Examine for the rational roots of x8- 3x + 1 = 0

  22. 5 x 3 = 15
  23. If α and β are the roots of the quadratic equation 2x2−7x+13 = 0 , construct a quadratic equation whose roots are α2 and β2.

  24. Find the sum of squares of roots of the equation 2x4- 8x3+ 6x2-3 = 0.

  25. If α, β, and γ are the roots of the polynomial equation ax3+ bx2+ cx + d = 0, find the value of \(\Sigma \frac { \alpha }{ \beta \gamma } \) in terms of the coefficients.

  26. Solve the equation x4-9x2+20 = 0.

  27. Solve the equation x3- 5x2- 4x + 20 = 0

  28. 3 x 5 = 15
  29. Solve the equation 3x- 16x+ 23x - 6 = 0 if the product of two roots is 1.

  30. Solve the equation (x-2) (x-7) (x-3) (x+2)+19 = 0

  31. Solve: (x - 4)(x - 7)(x - 2)(x + 1) = 16

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