4. What is a periodical?
2 answers:
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<span>The standard form is , where the focus is (h,k + p)
vertex at the origin and a directrix at y = 5. p = -5 (focus is (0,-5)
x^2 = -20y OR y = (-1/20)x^2</span>
vertex at the origin and a directrix at y = 5. p = -5 (focus is (0,-5)
x^2 = -20y OR y = (-1/20)x^2</span>