Solve x^2 + 6x = 24.
A−3 ± square root 21
B−3 ± square root 34
C−3 ± square root 15
D−3 ± square root 33
A−3 ± square root 21
B−3 ± square root 34
C−3 ± square root 15
D−3 ± square root 33