8. Find focus, vertex, equation of directrix, axis and length of latusrectum to the parabola x2 - 2x + 4y - 3=0
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i)Given parábola is y2 + 4x + 4y – 3 = 0 ⇒ y2 + 4y = –4x + 3 ⇒ (y + 2)2 - 4 = –4x + 3 ⇒ (y + 2)2 = –4x + 7 h=7/4, k=-2,a=1 Equation of the directrix: x – h – a = 0 x-7/4-1=0⇒4x-11=0 Equation of the axis is: y – k = 0 ⇒ y + 2 = 0 ii) Given parábola is x2 – 2x + 4y – 3 = 0 ⇒ x2 – 2x = –4y + 3 ⇒ (x – 1)2 - 1 = –4y + 3 ⇒ (x – 1)2 = –4y + 4 ⇒ (x – 1)2 = –4[y – 1] h = 1, k = 1, a = 1 Vertex A(h, k) = (1, 1) Focus (h, k – a) = (1, 1 – 1) = (1, 0) Equation of the directrix: y – k – a = 0 y – 1 – 1 = 0 ⇒ y – 2 = 0 Equation of the axis is, x – h = 0 ⇒ x – 1 = 0.Read more on Sarthaks.com - https://www.sarthaks.com/482440/find-the-coordinates-vertex-and-focus-equation-the-directrix-and-axis-following-parabolas
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