Basic Voltage divison question - is this correct
No, that's not correct. Here are some hints.


First, what is the total voltage across R1 and R2?
Now, what is the current flowing through R1 and R2?
What is the voltage across R2 alone?
The bottom end of R2 is at \$V_D\$. The top end of R2 is your
\$V_G\$. How is \$V_G\$ related to the voltage across R2 and \$V_D\$?