# What is the LCM of 8y, 18y^3 ?

It is $72 {y}^{3}$
You need ${y}^{3}$ and the factors of $8$ which is ${2}^{3}$ and of $18 = 2 \cdot {3}^{2}$ so: ${2}^{3} \cdot {3}^{2} \cdot {y}^{3} = 72 \cdot {y}^{3}$