Task: Question Answering
Input (English): Problem: if a ^ 2 + b ^ 2 = 25 and ab = 10 , what is the value of the expression ( a - b ) ^ 2 + ( a + b ) ^ 2 ? 
Options: a ) 10 , b ) 20 , c ) 30 , d ) 50 , e ) 70
Output (English): d