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If the circles x^(2) + y^(2) + 5 Kx + 2y...

If the circles `x^(2) + y^(2) + 5 Kx + 2y + K = 0` and `2x^(2) + y^(2)) + 2Kx + 3y - 1 = 0, (K in R)` intersect at the point P and Q then the line `4x + 5y - K = 0` passes P and Q for :

A

exactly one value of K

B

infinitely many values of K

C

no values of K

D

exactly two values of K

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to find the values of \( K \) such that the line \( 4x + 5y - K = 0 \) passes through the intersection points \( P \) and \( Q \) of the two given circles. ### Step-by-Step Solution: 1. **Identify the equations of the circles:** The equations of the circles are: \[ S_1: x^2 + y^2 + 5Kx + 2y + K = 0 \] \[ S_2: 2x^2 + y^2 + 2Kx + 3y - 1 = 0 \] 2. **Find the equation of the radical axis (common chord):** The radical axis can be found by subtracting the two circle equations: \[ S_1 - S_2 = 0 \] This gives: \[ (x^2 + y^2 + 5Kx + 2y + K) - (2x^2 + y^2 + 2Kx + 3y - 1) = 0 \] Simplifying this: \[ -x^2 + 3Kx - y + K + 1 = 0 \] Rearranging: \[ x^2 - 3Kx + y - (K + 1) = 0 \] 3. **Set the radical axis equal to the line equation:** The line equation is: \[ 4x + 5y - K = 0 \] We want this line to be identical to the radical axis. Thus, we can equate the coefficients: \[ 4x + 5y - K = 0 \quad \text{and} \quad x^2 - 3Kx + y - (K + 1) = 0 \] 4. **Compare coefficients:** From the radical axis equation, we can express it in the form: \[ y = -\frac{1}{5} (4x - K) \] By comparing coefficients, we have: - Coefficient of \( x \): \( 4 = -3K \) - Coefficient of \( y \): \( 5 = 1 \) - Constant term: \( -K = -(K + 1) \) 5. **Solve for \( K \):** From \( 4 = -3K \): \[ K = -\frac{4}{3} \] From the constant term: \[ -K = -K - 1 \implies 0 = -1 \quad \text{(which is not possible)} \] 6. **Check for consistency:** The equations derived from the coefficients must hold true. If they lead to contradictions, it implies that there are no values of \( K \) for which the line passes through both intersection points. ### Conclusion: After analyzing the equations and finding contradictions, we conclude that there are no values of \( K \) for which the line \( 4x + 5y - K = 0 \) passes through both intersection points \( P \) and \( Q \).

To solve the problem, we need to find the values of \( K \) such that the line \( 4x + 5y - K = 0 \) passes through the intersection points \( P \) and \( Q \) of the two given circles. ### Step-by-Step Solution: 1. **Identify the equations of the circles:** The equations of the circles are: \[ S_1: x^2 + y^2 + 5Kx + 2y + K = 0 ...
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