If the -intercept of a focal chord of the parabola is , then the length of this chord is equal to:

16 Explanation: Solution 1. Standardize the Parabola Equation Complete the square for : Comparing this to : Vertex 2. Locate the Focus The focus of is : 3. Equation of the Focal Chord The chord passes through the Focus and has an -intercept of , meaning it passes through . The slope of the chord is: 4. Length of the Chord For a parabola , the length of a focal chord making an angle with the axis of the parabola is . Here, the slope , so , which means or .

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