Question

enter the missing values in the area model to find $9(9n - 9)$
area model image with 9 on the left, 81n in the first rectangle, -9 above the second rectangle
answer attempt 1 out of 2
according to the model above, $9(9n - 9) = \square$

Explanation:

Step1: Find top-left missing value

We know $9 \times x = 81n$, so solve for $x$:
$x = \frac{81n}{9} = 9n$

Step2: Find right box missing value

Calculate $9 \times (-9)$:
$9 \times (-9) = -81$

Step3: Combine the two areas

Add the results of the two boxes:
$81n + (-81) = 81n - 81$

Answer:

Missing top-left value: $9n$
Missing right box value: $-81$
$9(9n - 9) = 81n - 81$