$\"\"$

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Observe the graph:

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The coordinate points are $\"\"$ and $\"\"$ .

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The general equation of a quadratic function is $\"\"$ , $\"\"$ .

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The graph passes through $\"\"$ .

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Find $\"\"$ .

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$\"\"$ (Quadratic function)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Simplify)

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Rewrite the quadratic function is $\"\"$ .

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Find $\"\"$ .

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The graph passes through the point $\"\"$ and $\"\"$ .

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Case (i):

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$\"\"$ (Quadratic function)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Simplify)

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Case (ii):

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$\"\"$ (Quadratic function)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Simplify)

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Add simplified case (i) and case (ii) equations and find $\"\"$ value.

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$\"\"$

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$\"\"$ (Divide each side by $\"\"$ )

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$\"\"$ (Cancel common terms)

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$\"\"$

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Find $\"\"$ .

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$\"\"$ (Substitute )

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$\"\"$ (Multiply)

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$\"\"$ (Add $\"\"$ to each side)

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$\"\"$ (Divide each side by $\"\"$ )

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$\"\"$ (Cancel common terms)

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Find the quadratic equation.

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$\"\"$ (Quadratic function)

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$\"\"$ (Substitute $\"\"$ , $\"\"$ and $\"\"$ )

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Consider the test value from the graph $\"\"$ .

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$\"\"$

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$\"\"$ less than or equal to $\"\"$ and parabola is solid line.

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Hence the inequality is $\"\"$ .

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$\"\"$

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The inequality is $\"\"$ .