Answer:
r = 3 or r = -6
Step-by-step explanation:
Solve for r over the real numbers:
(r - 3) (r + 6) = 0
Split into two equations:
r - 3 = 0 or r + 6 = 0
Add 3 to both sides:
r = 3 or r + 6 = 0
Subtract 6 from both sides:
Answer: r = 3 or r = -6
r^2 = -3
