If the circle x^2 + y^2 - 6x - 8y + (25 - a^2) = 0 touches the axis of x, then a equals.

JEE Main 2013 Mathematics question

If the circle touches the axis of x, then a equals.

Answer: (2)

Centre (3, 4), radius . Touching the x-axis

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Question ID VK-104143