$\"\"$

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The focus of parabola $\"\"$ and directrix $\"\"$ .

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The standard form of horizontal parabola $\"\"$ .

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Where center is $\"\"$ , focus is $\"\"$ and directrix is $\"\"$ .

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Directrix $\"\"$ then point on the axis is $\"\"$ .

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The vertex of the vertical parabola is $\"\"$ .

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Mid point of the focus $\"\"$ and point on axis $\"\"$ is $\"\"$ .

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Hence, $\"\"$

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$\"\"$

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Here, focus of the parabola is $\"\"$ .

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$\"\"$ ,

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As $\"\"$ then $\"\"$ .

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Therefore, $\"\"$ the parabola is open downwards.

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$\"\"$

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Find the parabola equation.

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The standard form of horizontal parabola $\"\"$ .

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Substitute $\"\"$ and $\"\"$ in standard form.

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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The parabola equation $\"\"$ .