Task: Question Answering
Input (English): Problem: y = x ^ 2 + bx + 512 cuts the x axis at ( h , 0 ) and ( k , 0 ) . if h and k are integers , what is the least value of b ? 
Options: a ) - 512 , b ) - 257 , c ) - 256 , d ) - 513 , e ) 128
Output (English): d