The coordinates of the focus of the parabola −0.25x2 = y − 2 are:
A. (0, 6) B. (0, 1) C. (0, −2) D. (0, 3 )

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(1) Answers

Skyheart

The equation is [latex]-0.25x^2-x+2=0[/latex]
The coordinates are [latex](\frac{-b}{2a};\frac{-\Delta}{4a})[/latex]
[latex]\Delta=b^2-4ac=1+2=3[/latex]
The coordinates, thus, are [latex](\frac{1}{-0.5};\frac{-1}{-1})=(-2;1)[/latex]