$\"\"$

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Original function is $\"\"$ .

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Replace x = 3 in original function.

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$\"\"$

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Evaluate powers: $\"\"$ .

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$\"\"$

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$\"\"$ (Evaluate powers: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Add: 18 + 1 = 19)

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

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Replace x = – 1 in original function.

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$\"\"$

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Evaluate powers: $\"\"$ .

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$\"\"$

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Evaluate powers: $\"\"$ .

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$\"\"$

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

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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The solutions are $\"\"$ and $\"\"$ .