$\"\"$

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The qudractic function is $\"\"$ .

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To find the x-intercept.

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$\"\"$ (Substitute f (x) = 0) \ \ The equation compare to quadratic equation, then a = 4, b = $\"\"$ 9 and c = 4. $\"\"$

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Quadratic formula: $\"\"$ .

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$\"\"$ (Substitute a = 4, b = $\"\"$ 9 and c = 4)

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$\"\"$ (Product of two same signs is positive)

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$\"\"$ (Evaluate power: $\"\"$ )

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$\"\"$ (Simplify)

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$\"\"$ (Subtract: $\"\"$ ) $\"\"$

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Using calculator and Evaluate square roots: $\"\"$ .

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$\"\"$

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Separate the solutions $\"\"$ .

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$\"\"$ (Simplify)

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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The solution set is $\"\"$ .