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OpenStudy (anonymous):
What is the focus of the parabola given by the equation y =-1/28x^2?
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OpenStudy (anonymous):
(-1/112,0) I think so...
OpenStudy (anonymous):
No, it is either (-7,0), (0,7), (0,-7), (7,0)
OpenStudy (zehanz):
General formula: x²=4py, then focus is (0,p). So do a little reworking of the formula to get your focus!
OpenStudy (zehanz):
So... \( x^2=-28y=4 \cdot -7y\). Methinks focus is (-7,0).
OpenStudy (anonymous):
Thank you
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OpenStudy (zehanz):
YW!
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