Answer:
36x²y²z²
.......................
Step-by-step explanation:
like terms
3×3x × x ×y×y×4z×z
= 3× 3x² × y² ×4z²
= 3(3x² × y² ×4z²)
= 3(12x²y²z²)
= 36x²y²z²
