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Find the focus and directrix of the following parabola: \( (y-4)^{2}=16(x-6) \) Focus: \( (10,[?]) \) Directrix: \( x= \)

Ask by Reid Brooks. in the United States
Jan 20,2025

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Answer

Focus: \( (10, 4) \) Directrix: \( x = 2 \)

Solution

To find the focus and directrix of the parabola given by the equation: \[ (y - 4)^2 = 16(x - 6) \] Let's compare this with the standard form of a parabola that opens horizontally: \[ (y - k)^2 = 4p(x - h) \] **Step 1: Identify the Parameters** From the given equation: - \( h = 6 \) - \( k = 4 \) - \( 4p = 16 \) ⇒ \( p = 4 \) **Step 2: Determine the Focus** For a parabola that opens to the right, the focus is located at: \[ (h + p, k) = (6 + 4, 4) = (10, 4) \] **Step 3: Determine the Directrix** The directrix is a vertical line located at: \[ x = h - p = 6 - 4 = 2 \] **Final Answer:** - **Focus:** \( (10, \,4) \) - **Directrix:** \( x = 2 \)

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The equation you provided is in the standard form of a horizontal parabola, \( (y-k)^{2} = 4p(x-h) \), where \( (h, k) \) is the vertex, and \( p \) is the distance from the vertex to the focus (positive in the direction the parabola opens). Here, \( h = 6 \), \( k = 4 \), and \( 4p = 16 \) implies that \( p = 4 \). To find the focus, we start from the vertex \( (h, k) = (6, 4) \). Since the parabola opens to the right, we move \( p \) units to the right. Thus, the focus is at \( (h + p, k) = (6 + 4, 4) = (10, 4) \). The directrix is a vertical line located \( p \) units to the left of the vertex. Therefore, the directrix is \( x = h - p = 6 - 4 = 2 \). Focus: \( (10, 4) \) Directrix: \( x = 2 \)

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