\( 1 \leftarrow \left\lvert\, \begin{array}{l}\text { Perform the indicated operations } \\ (15-17)(7-3) \\ (15-17)(7-3)=\square\end{array}\right. \)

To solve the expression \( (15-17)(7-3) \), we first need to simplify each part separately. First, calculate \( 15 - 17 \) which equals \( -2 \). Next, for \( 7 - 3 \), the result is \( 4 \). Now, we multiply the two results together: \[ (-2)(4) = -8 \] So, \( (15-17)(7-3) = -8 \). Now we can fill in the square: \[ (15-17)(7-3) = -8 = \square. \]