Answer
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Our focus is (-3,0)
↓Steps Explained:↓
Evaluate the horizontal parabola
y2 = -12x
Determine coordinates of the focus:
Since our x coefficient of -12 is negative
The parabola opens left
horizontal parabola equation
y2 = 4cx
4c = -12
Divide each side by 4:
c = -3
Our focus is (-3,0)
Determine directrix equation:
Directrix is in the form x = c, so we have x = -3
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