Completing the square to write
Use completing the square to write each equation in form y=a(x-h)^2 +k and identify the vertex, focus, and directrix. Please show steps and explain,
1) y=x^2+2x-5
2) y=3x^2 + 12x +1
3) y=-3x^2 -6x+5
4) y=-2x^2+12x
5) y=1/4x^2 + 1/2x -7/4
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