Home
Class 10
MATHS
If alpha and beta are zeros of the polyn...

If `alpha` and `beta` are zeros of the polynomial `t^(2)-t-4`, form a quadratic polynomial whose zeros are `(1)/(alpha)` and `(1)/(beta)`.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to find a quadratic polynomial whose zeros are \( \frac{1}{\alpha} \) and \( \frac{1}{\beta} \), given that \( \alpha \) and \( \beta \) are the zeros of the polynomial \( t^2 - t - 4 \). ### Step-by-Step Solution: 1. **Identify the Coefficients of the Given Polynomial:** The polynomial is \( t^2 - t - 4 \). Here, we can identify: - \( a = 1 \) - \( b = -1 \) - \( c = -4 \) 2. **Calculate the Sum and Product of the Roots \( \alpha \) and \( \beta \):** Using the relationships for the sum and product of roots: - Sum of the roots \( \alpha + \beta = -\frac{b}{a} = -\frac{-1}{1} = 1 \) - Product of the roots \( \alpha \beta = \frac{c}{a} = \frac{-4}{1} = -4 \) 3. **Find the Sum and Product of the New Roots \( \frac{1}{\alpha} \) and \( \frac{1}{\beta} \):** - Sum of the new roots: \[ \frac{1}{\alpha} + \frac{1}{\beta} = \frac{\beta + \alpha}{\alpha \beta} = \frac{1}{-4} = -\frac{1}{4} \] - Product of the new roots: \[ \frac{1}{\alpha} \cdot \frac{1}{\beta} = \frac{1}{\alpha \beta} = \frac{1}{-4} = -\frac{1}{4} \] 4. **Form the Quadratic Polynomial:** A quadratic polynomial with roots \( p \) and \( q \) can be expressed as: \[ x^2 - (p + q)x + pq \] Substituting \( p = \frac{1}{\alpha} \) and \( q = \frac{1}{\beta} \): \[ t^2 - \left(-\frac{1}{4}\right)t + \left(-\frac{1}{4}\right) \] This simplifies to: \[ t^2 + \frac{1}{4}t - \frac{1}{4} \] 5. **Eliminate the Fraction:** To write the polynomial in a standard form, we can multiply through by 4 to eliminate the fractions: \[ 4t^2 + t - 1 \] ### Final Result: The required quadratic polynomial whose zeros are \( \frac{1}{\alpha} \) and \( \frac{1}{\beta} \) is: \[ 4t^2 + t - 1 \]
Promotional Banner

Topper's Solved these Questions

  • POLYNOMIALS

    CBSE COMPLEMENTARY MATERIAL|Exercise Short answer type (ii) question|10 Videos
  • POLYNOMIALS

    CBSE COMPLEMENTARY MATERIAL|Exercise Long answer type question|10 Videos
  • POLYNOMIALS

    CBSE COMPLEMENTARY MATERIAL|Exercise Practice test|10 Videos
  • PAIR OF LINEAR EQUATIONS IN TWO VARIABLES

    CBSE COMPLEMENTARY MATERIAL|Exercise PRACTICE-TEST (SECTION-D)|1 Videos
  • PRACTICE PAPER II

    CBSE COMPLEMENTARY MATERIAL|Exercise SECTION C|14 Videos

Similar Questions

Explore conceptually related problems

If alpha and beta are the two zeros of the polynomial 25p^(2)-15p+2, a quadratic polynomial whose zeros are (1)/(2 alpha) and (1)/(2 beta) is

If alpha,beta are zeroes of the polynomial x^(2)-2x-15, then form a quadratic polynomial whose zeroes are (2 alpha) and (2 beta)

If alpha and beta are zeroes of a quadratic polynomial x^(2)-5, then form a quadratic polynomial whose zeroes are 1+alpha and 1+beta

If alpha and beta are zeroes of the polynomial 6y^2 – 7y + 2 , find the quadratic polynomial whose zeroes are 1/alpha and 1/beta

If alpha and beta are the zeros of a polynomial 2x^(2)-3x+5=0 .form a quadratic polynomial whose zeros are (alpha+beta) and (1/ alpha+1/ beta)

If alpha and beta are the zeros of the quadratic polynomial f(x)=x^(2)-3x-2, find a quadratic polynomial whose zeros are (1)/(2 alpha+beta) and (1)/(2 beta+alpha)

If alpha and beta are the zeros of the quadratic polynomial f(x)=x^(2)-3x-2, find a quadratic polynomial whose zeros are (1)/(2 alpha+beta) and (1)/(2 beta+alpha)

If alpha and beta are the zeros of the quadratic polynomial f(x)=3x^(2)-4x+1, find quadratic polynomial whose zeros are (alpha^(2))/(beta) and (beta^(2))/(alpha)

If alpha and beta are the zeros of the quadratic polynomial f(x)=3x^(2)-4x+1, find a quadratic polynomial whose zeros are (alpha^(2))/(beta) and (beta^(2))/(alpha).