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The general equation of a parabola is y = ax2 + bx + c.

The vertex of a parabola is (-b/2a, c - b2/4a). In our case the vertex is (2, -4). So we have,

-b/2a = 2, so that b = -4a, and

c - b2/4a = -4 (substitute -4a for b)
c - (-4a)2/4a = -4
c = 16a2/4a = -4 (simplify)
c - 4a = -4 (solve for c)
c = 4a - 4

By substituting -4a for b, and 4a - 4 for c, the equation becomes,

y = ax2 + bx + c
y = ax2 + (-4a)x + 4a - 4

Since it is given that when x = -3, y = -3, we substitute them into the new equation and solve it for a. So we have,

y = ax2 + (-4a)x + 4a - 4
-3 = a(-3)2 + (-4a)(-3) + 4a - 4
-3 = 9a + 12a + 4a - 4 (add 4 to both side, and add alike terms on the right-hand side)
1 = 25a (divide by 25 to both sides)
1/25 = a (this is the required answer)

If you want to find the equation of the parabola, just substitute 1/25 for a, such as:

y = ax2 + (-4a)x + 4a - 4
y = (1/25)x2 + [-4(1/25)]x + 4(1/25) - 4
y = (1/25)x2 -4/25x + 4/25 - 4
y = (1/25)x2 -4/25x + 96/25

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