Answer
The error is in the second step. and the correct answer is $512$.
Work Step by Step
The given expression is
$=2^4\cdot 2^5$
Use the power of a product property.
$=2^{4+ 5}$
Simplify.
$=2^{9}$
$=512$
Hence, the error is in the second step. and the correct answer is $512$.
