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A quadratic function represents a parabola in the graph.

The quadratic function $\"\"$ .

Compare with standard form of quadratic function $\"\"$ .

$\"\"$ .

Since $\"\"$ ,the parabola opens downwards and it has maximum value.

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Maximum value of a quadratic function is vertex $\"\"$ .

$\"\"$ .

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Maximum point is $\"\"$ = $\"\"$ .

Maximum value of the function is $\"\"$

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Maximum value of the function is $\"\"$ .