Question

(-2/5 a^4 b)^3∙(-125a^3 b)

Answer 1

$(-frac{2}{5}a^4b)^3*(-125a^3b)=\ -frac{2^3}{5^3}(a^4)^3b^3*(-125)a^3b=\ -frac{8}{125}*(-125)a^{4*3}a^3b^{3+1}=\ 8a^{12}a^3b^4=\ 8a^{12+4}b^4=\ 8a^{16}b^4$