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

Options

  1. A0
  2. B4
  3. C2
  4. D3

Correct answer

B. 4

Step-by-step solution

aligned & x^2+y^2-6 x-8 y+ (25-a^2 )=0 & Radius =4= 9+16+ (25-a^2 ) & a = 4 aligned

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