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Theory of Equations - Two Marks Study Materials

12th Standard

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Maths

Time : 01:00:00 Hrs
Total Marks : 30
    15 x 2 = 30
  1. Construct a cubic equation with roots 1, 2 and 3

  2. If α, β, γ  and \(\delta\) are the roots of the polynomial equation 2x+ 5x− 7x+ 8 = 0, find a quadratic equation with integer coefficients whose roots are α + β + γ + \(\delta\) and αβ૪\(\delta\).

  3. Show that the equation 2x2− 6x +7 = 0 cannot be satisfied by any real values of x.

  4. Show that if p, q, r  are rational the roots of the equation x− 2px + p− q+ 2qr − r= 0 are rational.

  5. Obtain the condition that the roots of x3+ px2+ qx + r = 0 are in A.P.

  6. Discuss the nature of the roots of the following polynomials:
    x2018+1947x1950+15x8+26x6+2019

  7. Solve the equations:
    6x4- 35x3+ 62x2- 35x + 6 = 0

  8. Find the exact number of real zeros and imaginary of the polynomial x9+9x7+7x5+5x3+3x.

  9. Construct a cubic equation with roots 2, −2, and 4.

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

  11. If sin ∝, cos ∝ are the roots of the equation ax2 + bx + c-0 (c ≠ 0), then prove that (n + c)2 - b2 + c2

  12. Find value of a for which the sum of the squares of the equation x2 - (a- 2) x - a -1 = 0 assumes the least value.

  13. Find the Interval for a for which 3x2+2(a2+1) x+(a2-3a+2) possesses roots of opposite sign.

  14. Find x If \(x=\sqrt { 2+\sqrt { 2+\sqrt { 2+....+upto\infty } } } \)

  15. Find the number of positive and negative roots of the equation x7 - 6x6 + 7x5 + 5x2+2x+2

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