Answer: Third option is correct.
Explanation:
Since we have given that
The square of the sum of 7 times x and 3 divided by 4 times the difference of x and 1.
The square of the sum of 7 times x and 3 would be written as

and 4 times the difference of x and 1 is written as

Mathematically, it is expressed as

Hence, Third option is correct.