Answer
$10010100001$
Work Step by Step
Replace each hexadecimal digit with its equivalent 4-digit binary form. Add zeroes to the front of the binary value if necessary to create a 4-digit number.
$4_{16}=4_{10}=2^2=100_2=0100_2$
$A_{16}=10_{10}=2^3+2^1=1010_2$
$A_{16}=10_{10}=2^3+2^1=1010_2$
$1_{16}=1_{10}=2^0=1_2=0001_2$
The leading zeroes can be dropped from the first group of 4 when writing the final answer.
$\underbrace{\ \ \ 4\ \ \ }\ \underbrace{\ \ \ A\ \ \ }\ \underbrace{\ \ \ A\ \ \ }\ \underbrace{\ \ \ 1\ \ \ }$
$0100\ \ \ 1010\ \ \ 1010\ \ \ 0001$
