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Statement-1: The line x+9y-12=0 is the ...

Statement-1: The line `x+9y-12=0` is the chord of contact of tangents drawn from a point P to the circle `2x^(2)+2y^(2)-3x+5y-7=0`.
Statement-2: The line segment joining the points of contacts of the tangents drawn from an external point P to a circle is the chord of contact of tangents drawn from P with respect to the given circle

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.

B

Statement-1 is True, Statement-2 is not a correct explanation for Statement-1.

C

Statement-1 is True, Statement-2 is False.

D

Statement-1 is False, Statement-2 is True.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the two statements given regarding the chord of contact of tangents drawn from an external point to a circle. ### Step-by-Step Solution: 1. **Identify the Circle's Equation**: The equation of the circle is given as: \[ 2x^2 + 2y^2 - 3x + 5y - 7 = 0 \] We can rewrite this in standard form by dividing the entire equation by 2: \[ x^2 + y^2 - \frac{3}{2}x + \frac{5}{2}y - \frac{7}{2} = 0 \] 2. **Complete the Square**: To convert the equation into standard form, we complete the square for both \(x\) and \(y\): - For \(x\): \[ x^2 - \frac{3}{2}x = \left(x - \frac{3}{4}\right)^2 - \frac{9}{16} \] - For \(y\): \[ y^2 + \frac{5}{2}y = \left(y + \frac{5}{4}\right)^2 - \frac{25}{16} \] Substituting these back into the equation gives: \[ \left(x - \frac{3}{4}\right)^2 + \left(y + \frac{5}{4}\right)^2 = \frac{7}{2} + \frac{9}{16} + \frac{25}{16} \] Simplifying the right side: \[ \frac{7}{2} = \frac{56}{16}, \quad \text{thus,} \quad \frac{56 + 9 + 25}{16} = \frac{90}{16} = \frac{45}{8} \] So, the center of the circle is \(\left(\frac{3}{4}, -\frac{5}{4}\right)\) and the radius is \(\sqrt{\frac{45}{8}}\). 3. **Equation of the Chord of Contact**: The chord of contact from a point \(P(h, k)\) to the circle is given by: \[ hx + ky - \frac{3}{4}h - \frac{5}{4}k - \frac{7}{2} = 0 \] We need to check if the line \(x + 9y - 12 = 0\) can be expressed in this form. 4. **Equate the Coefficients**: The line \(x + 9y - 12 = 0\) can be rearranged to: \[ 1x + 9y - 12 = 0 \] Comparing coefficients, we have: - \(h = 1\) - \(k = 9\) - \(-\frac{3}{4}h - \frac{5}{4}k - \frac{7}{2} = -12\) Substituting \(h\) and \(k\): \[ -\frac{3}{4}(1) - \frac{5}{4}(9) - \frac{7}{2} = -12 \] Simplifying: \[ -\frac{3}{4} - \frac{45}{4} - \frac{14}{4} = -12 \quad \Rightarrow \quad -\frac{62}{4} = -12 \quad \Rightarrow \quad -15.5 \neq -12 \] Hence, the line does not satisfy the equation of the chord of contact. 5. **Conclusion**: Since the point \(P(1, 9)\) does not lie outside the circle (as calculated), the line \(x + 9y - 12 = 0\) cannot be the chord of contact. Therefore, **Statement 1 is false**. **Statement 2** is a general truth about the chord of contact, hence it is true. ### Final Answer: - Statement 1: False - Statement 2: True

To solve the problem, we need to analyze the two statements given regarding the chord of contact of tangents drawn from an external point to a circle. ### Step-by-Step Solution: 1. **Identify the Circle's Equation**: The equation of the circle is given as: \[ 2x^2 + 2y^2 - 3x + 5y - 7 = 0 ...
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