How I can find the focus and directrix of these parables?
1: X 2 = 8y ^ 2-6x ^ 2 = y 3: y = 8x ^ 2 4: 4y ^ 2 = x If Please explain, he used the formula … Thanks!
in memory of director's approach and the formula y = (1/4p) x ², which is a parable opening whose apex is at the origin. The focus is on (0, p) and directrix is y =- p. And enough to properly modify horizontal parabolas. 1. y = (8.1) ² = 2 px focus (0, 2) y = -2 2 Director. x = (-1 / 6) ² = 1/4p -1 / 6, if p = -6 / 4 = -3 / 2 point (-3 / 2, 0) = x parable Director 3.2 (Open left) 3. y = 8x ² 1/4p = 8, p if y = 1 / 32 focus (0, 1 / 32) = -1 / 32 Guideline 4. 1/4p x = 4y ² = 4, so p = 1 / 16 focus (1 / 16, 0) = -1/16 x Director
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