Which mathematical statement is correct?
a. ( x + 4) ( x - 3) = x2 - x – 12
b. ( x + 2)(x + 5) = x2 + 8x + 10
c. (x + 5) ( x – 3 ) = x2 +2x - 15
d. ( x + 4) ( x – 5) = x2 + x – 20

need answers​