$\"\"$

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Original function is $\"\"$ .

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Replace x = 4 in original function.

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$\"\"$

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Evaluate powers: $\"\"$ .

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$\"\"$

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

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Apply commutative property of addition: a + b = b + a.

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$\"\"$

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$\"\"$ (Add: 256 + 32 = 288)

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

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

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Replace x = $\"\"$ 2 in original function.

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$\"\"$

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

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

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$\"\"$ (Add: 16 + 56 = 72)

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

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

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$\"\"$ , and $\"\"$ .