Given that 16p^2+49q^2-4r^2-56pq=0. Which one of the following is a point on a pair of straight lines (px+qy+r)(px+qy-r)=0?

NDA 2023 Mathematics question

Given that . Which one of the following is a point on a pair of straight lines (px+qy+r)(px+qy-r)=0?

Answer: (B)

The condition is . The pair of lines is . At the point $(2,

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Question ID VK-029734