Which expression is equivalent to -

Lets get started :)

Referring to the picture I have uploaded might help you
We have the same base, which in this case is x. 

When multiplication occurs in the same base, we add the powers

   ↓ (I am going to perform the problem separately and then give the final answer as the power to x)
= 
  ↓
x²



The power of a power should be performed by multiplying the powers together.
2 x  = 



Your final answer will be the second option