Explanation:
the solution (-3, -3):
-3 = a(-3)^2 + b(-3) + c
-3 = 9a - 3b + c (Equation)
the solution (3, -3):
-3 = a(3)^2 + b(3) + c
-3 = 9a + 3b + c (Equation 2)
Combining both equations, we have the system:
9a - 3b + c = -3
9a + 3b + c = -3
Simplifying this system, we get:
9a - 3b + c = -3
9a + 3b + c = -3