The difference of the square of a number and three times the sum of the number and 7 is more than the product of that number and 15.
Select the inequality that can be used to determine the unknown number.
A.
x2 + 3x ≥ 15 + x
B.
x2 - 3x + 21 > 15 + x
C.
x2 - 3x + 7 ≥ 15x
D.
x2 - 3x - 21 > 15x