Question

Simplify the expression:
(5y^7)^-3

Answer 1

$(a^{m} )^{n} =a^{m*n}$
$a^{-n} = \frac{1}{ a^{n} }$


$(5y^{7} )^{-3} =5y^{7*(-3)} = \frac{1}{(5y)^{7*3} } = \frac{1}{125y^{21} }$