The function f(x)= $\"\"$ .

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The standard form of the quadratic expression is $\"\"$

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The solution of the expression is x $\"\"$

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Substitute $\"\"$ \ \

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$\"\"$ \ \

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$\"\"$ \ \

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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So the approximate values of x $\"\"$ .

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