$\"\"$

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The sentence is “6 times the sum of $\"\"$ and $\"\"$ squared minus 3 times the sum

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of $\"\"$ and $\"\"$ squared.

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The word “times” indicates multiplication and the symbol is ( $\"\"$ ).

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The word “minus” represents the symbol ( $\"\"$ ).

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$\"\"$

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The algebraic expression is $\"\"$ .

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$\"\"$

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$\"\"$ (Apply distributive property: $\"\"$ )

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

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

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$\"\"$ (Apply commutative property of addition: $\"\"$ )

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$\"\"$ (Apply distributive property: $\"\"$ )

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

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$\"\"$

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The simplified expression is $\"\"$ .