Find the area of the polynomial: A.) 6a^3 + 12a^2 − 15a
B.) 6a^3 + 12a − 15
C.) 6a^2 + 12a − 15
D.) 5a^2 + 7a − 2

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36