Answer:
False. 
 is not a Linear expression.
 is not a Linear expression.
Explanation:
Given: 

we need to find whether it is a linear expression or not.
By Definition of Linear expression we say,
Linear expression is an algebraic expression where the power of variable(s) is equals to 1 
Or we can say that: 
Polynomial having power of variable(s) as 1, is known as Linear Expression 
In the above expression the power of variable is 2 hence it is not a linear expression.
Hence the statement is False, the 
 is not a Linear expression.
 is not a Linear expression.