Answer:
[tex]\displaystyle 5b^{-4}[/tex]
Step-by-step explanation:
[tex]\displaystyle 5b^{-4} = (-5a^4b^{-7})(-a^{-4}b^3) \\ \\ \frac{5}{b^4} = 5b^{-4}[/tex]
According to the Negative Exponential Rule [part II], you bring the denominator to the numerator WHILE ALTERING THE INTEGER SYMBOL FROM POSITIVE TO NEGATIVE:
[tex]\displaystyle b^{-n} = \frac{1}{b^n}[/tex]
I am joyous to assist you anytime.
