$\"\"$

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The parabola equation is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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The general parabola equation is $\"\"$ .

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Comapre the equation with $\"\"$ .

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Here $\"\"$ and $\"\"$ .

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Here $\"\"$ is negative then the parabola opens leftward.

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

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The focus of the parabola is $\"\"$ .

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$ .

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The directrix of the parabola is $\"\"$ .

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Graph:

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Graph the parabola $\"\"$ .

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$\"\"$

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$\"\"$

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

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The focus of the parabola is $\"\"$ .

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The directrix of the parabola is $\"\"$ .

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Graph of the parabola is

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$\"\"$ .