The length of the intercept made by the circle $x^2 + y^2 - 10x + 4y + 9 = 0$ on the x-axis is:
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The x-intercept of a circle is $2\sqrt{g^2 - c}$, while the y-intercept is $2\sqrt{f^2 - c}$. Memorizing both helps solve intercept problems instantly.