A parabola can be represented by the equation x2 = –20y.
Answer
A
(–5,0)
B
(5,0)
C
(0,5)
D
(0,–5)
Explanation
Compare x² = –20y with the standard form x² = 4py, where the focus is (0, p). Since 4p = –20, p = –5, so the focus is (0, –5). The correct choice is D, (0, –5).
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