Simplify (y^7)^-3

${(y^{7})}^{- 3}$

Step 1

Multiply the exponents in ${(y^{7})}^{- 3}$ .

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$y^{7 \cdot - 3}$

Multiply $7$ by $- 3$ .

$y^{- 21}$

Step 2

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{y^{21}}$