To solve this you must use the rules of PEMDAS (Parentheses, Exponent, Multiplication, Division, Addition, Subtraction)
 
First we have parentheses.
(4 + 3)² + 5
4 + 3 = 7
7² + 5 
 
 
 
Next solve the exponent. 
7² + 5
7² = 7 × 7 = 49
49 + 5
 
 
 
Now for the addition
49 + 5
54 
 
 
Hope this helped! 
~Just a girl in love with Shawn Mendes