Simplify.

a) [[$ x \cdot 5 \cdot x \cdot 4 $]]

b) [[$ y \cdot 2 \cdot x \cdot (-2) $]]

c) [[$ -4 \cdot b \cdot 2 \cdot a \cdot (-a) $]]

Take a picture of your solution and return it to the submission folder.

Solution