1. Understand the problem:
We are given the Arithmetic Mean (A.M.) and Geometric Mean (G.M.) of the roots of a quadratic equation as 5 and 4, respectively. We need to find the quadratic equation from the given options.
2. Let the roots be \( \alpha \) and \( \beta \):
The A.M. of the roots is given by:
\[ \frac{\alpha + \beta}{2} = 5 \implies \alpha + \beta = 10 \]
The G.M. of the roots is given by:
\[ \sqrt{\alpha \beta} = 4 \implies \alpha \beta = 16 \]
3. Form the quadratic equation:
A quadratic equation with roots \( \alpha \) and \( \beta \) is:
\[ x^2 - (\alpha + \beta)x + \alpha \beta = 0 \]
Substituting the values:
\[ x^2 - 10x + 16 = 0 \]
Correct Answer: (D) \( x^2 - 10x + 16 = 0 \)
Let the roots of the quadratic equation be \( \alpha \) and \( \beta \).
The arithmetic mean (AM) of the roots is given by:
\[ \text{AM} = \frac{\alpha + \beta}{2} = 5 \] \[ \alpha + \beta = 10 \]The geometric mean (GM) of the roots is given by:
\[ \text{GM} = \sqrt{\alpha \beta} = 4 \] \[ \alpha \beta = 16 \]A quadratic equation with roots \( \alpha \) and \( \beta \) can be written as:
\[ x^2 - (\alpha + \beta)x + \alpha \beta = 0 \]Substituting the values of \( \alpha + \beta \) and \( \alpha \beta \), we get:
\[ x^2 - 10x + 16 = 0 \]Therefore, the quadratic equation is \( x^2 - 10x + 16 = 0 \).
The graph between variation of resistance of a wire as a function of its diameter keeping other parameters like length and temperature constant is
While determining the coefficient of viscosity of the given liquid, a spherical steel ball sinks by a distance \( x = 0.8 \, \text{m} \). The radius of the ball is \( 2.5 \times 10^{-3} \, \text{m} \). The time taken by the ball to sink in three trials are tabulated as shown: