8x*3y*(-5y)-7x²*(-4y)

To simplify the expression \( 8x \cdot 3y \cdot (-5y) - 7x^2 \cdot (-4y) \), follow these steps: 1. **Distribute the terms**: - For the first term: \[ 8x \cdot 3y \cdot (-5y) = 8 \cdot 3 \cdot (-5) \cdot x \cdot y \cdot y = -120xy^2 \] - For the second term: \[ -7x^2 \cdot (-4y) = 7 \cdot 4 \cdot x^2 \cdot y = 28x^2y \] 2. **Combine the simplified terms**: Now, we can combine both parts: \[ -120xy^2 + 28x^2y \] Thus, the simplified form of the expression is: \[ 28x^2y - 120xy^2 \]