$\"\"$

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The function is $\"\"$ .

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$\"\"$ can be written as $\"\"$ .

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Let $\"\"$ .

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$\"\"$ is in the form of $\"\"$ .

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$\"\"$ can be written as $\"\"$ .

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The factored form of $\"\"$ is $\"\"$ .

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$\"\"$

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Therefore $\"\"$ has $\"\"$ real zero at $\"\"$ .

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$\"\"$

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Create a sign chart using the value $\"\"$ .

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$\"\"$

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Note : The solid circle denote that the value are included in the solution set.

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Observe the sign chart :

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The set of value of $\"\"$ denoted in blue color represents the solution set.

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Determine whether $\"\"$ is positive or negative on the test intervals.

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If $\"\"$ ,then $\"\"$ .

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If $\"\"$ , then $\"\"$ .

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The solutions of $\"\"$ are $\"\"$ values such that $\"\"$ is negative or equal to $\"\"$ .

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From the sign chart, you can see that the solution set is $\"\"$ .

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The solution set is $\"\"$ .

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$\"\"$

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The solution set of $\"\"$ is $\"\"$ .