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\left(4a^{2}\right)^{-2}
Use the rules of exponents to simplify the expression.
4^{-2}\left(a^{2}\right)^{-2}
To raise the product of two or more numbers to a power, raise each number to the power and take their product.
\frac{1}{16}\left(a^{2}\right)^{-2}
Raise 4 to the power -2.
\frac{1}{16}a^{2\left(-2\right)}
To raise a power to another power, multiply the exponents.
\frac{1}{16}\times \frac{1}{a^{4}}
Multiply 2 times -2.
\left(4a^{2}\right)^{-2}
Use the rules of exponents to simplify the expression.
4^{-2}\left(a^{2}\right)^{-2}
To raise the product of two or more numbers to a power, raise each number to the power and take their product.
\frac{1}{16}\left(a^{2}\right)^{-2}
Raise 4 to the power -2.
\frac{1}{16}a^{2\left(-2\right)}
To raise a power to another power, multiply the exponents.
\frac{1}{16}\times \frac{1}{a^{4}}
Multiply 2 times -2.