Simplify the radical

Answer:
[tex]\boxed{\tt = y {}^{2} \cdot \: z {}^{3} \sqrt{z}}[/tex]
Step-by-step explanation:
Given,
[tex] \sqrt{y {}^{4} \cdot {z}^{2} } [/tex]
Solution:
[tex] = \sqrt{( y {}^{2} {})^{2} \cdot \: z {}^{6} z} [/tex]
[tex]= \sqrt{( y {}^{2} {})^{2} \cdot \: (z {}^{2}) {}^{3} z} [/tex]
[tex] = \sqrt{( {y}^{2} z {}^{3}) {}^{2}\cdot z } [/tex]
[tex] = y {}^{2} \cdot \: z {}^{3} \sqrt{z} [/tex]