3*3*(-1)

The expression \( 3 \times 3 \times (-1) \) can be calculated as follows:

1. First, calculate \( 3 \times 3 \): \[ 3 \times 3 = 9 \]

2. Then multiply that result by \(-1\): \[ 9 \times (-1) = -9 \]

So, \( 3 \times 3 \times (-1) = -9 \).