Write Using Positive Exponents -4a^-2b^-2

$- 4 a^{- 2} b^{- 2}$

Move $a^{- 2}$ to the denominator in $a^{- 2}$ using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{a^{2}}$

Move $b^{- 2}$ to the denominator in $b^{- 2}$ using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{b^{2}}$

Rewrite $- 4 a^{- 2} b^{- 2}$ with positive exponents.

$- 4 \frac{1}{a^{2}} \frac{1}{b^{2}}$