Keeping the properties of exponents in mind, to what power must you raise the expression 7 1/2 to get 7 as a result

For this case we have the following expression:
 
 Rewriting the expression we have:
 
 Where,
 x: exponent to which we must raise the expression to obtain 7 as a result.
 We have then:
 
 The exponent must be equal to 1:
 
 Clearing x we have: 
 
 Substituting valres:
 
 
 you must raise the expression to 2

I’m pretty sure the answer is a