Write each quadratic equation in standard form and identify the values of a, b, and c.

1. (X+7) (X-7) = -3x

2. (X-4)²+8=0

3. (X+2)²=3(X+2)

4. (2X - 1)²=(X+1)²

5. 2X(X+4)=(X-3)²