Simplify show some work please and thank you

Question

(-5ab⁴)³a^-3b⁶

    b^-2

 

Simplify and show work

 

Answer 1

(-5ab⁴)³a^-3b⁶
   b^-2

lets get rid of the denominator

1  
b^-2   is =  b²

 

so

= (-5ab⁴)³a^-3b⁶b² = (-5ab⁴)³a-³b⁸ = (-5³a³b^4·3)a^-3b⁸ = -125a³a^-3b¹²b⁸

 

= -125 b²⁰