Hello!
[tex](4x)^2(b^3)\\[/tex]
Explanation:
↓↓↓↓↓↓↓↓↓
First you had to remove parenthesis.
[tex](4x)^2b^3[/tex]
[tex](4x)^2=4^2x^2[/tex]
[tex]4^2b^3x^2[/tex]
[tex]4^2=4*4=16[/tex]
[tex]=16b^3x^2[/tex]
Answer⇒⇒⇒⇒⇒⇒⇒[tex]16b^3x^2[/tex]
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-Charlie