$\"\"$

The expression is $\"\"$ .

The values are $\"\"$ and $\"\"$ . \ \

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

$\"\"$ (Multiply)

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

$\"\"$ (Simplify)

$\"\"$ .

Therefore, the Lauren is evaluating simplification is correct.

Therefore, the Rico is evaluating wrong simplication since the addition is $\"\"$ .

$\"\"$

Lauren is correct .