`( 2xy^3 )^2 . 3 / 8 xz^2`
`= 4x^2y^6 . 3 / 8 xz^2`
`= ( 4 . 3 / 8 ) ( x^2 . x ) y^6z^2`
`= 3 / 2 x^3y^6z^2`
\(\left(2xy^3\right)^2\cdot\dfrac{3}{8}xz^2=4x^2y^6\cdot\dfrac{3}{8}xz^2=\dfrac{3}{2}x^3y^6z^2\)
= \(\left(2xy^3\right)^2x\dfrac{3}{8}xz^2\)
= \(4x^2y^6x\dfrac{3}{8}xz^2\)
= \(\dfrac{3}{2}x^3y^6z^2\)