Answer:
-3m^12n^6
Explanation:
-24m^5n^4/8m^-7n^-2
To simplify this expression we apply exponential property
a^m / a^n = a^m-n
When the exponents are in division then we subtract the exponents
-24/ 8 = -3
m^5 / m^-7 = m^(5-(-7))= m^12
n^4 / n^-2= n^(4-(-2))= n^6
Write all the terms together
-3m^12n^6