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The vertex of the parabola x2 + 12x – 9y = 0 is …(a) (6, -1) (b) (-6, 4) (c) (6, 4) (d) (-6, -4) |
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Answer» (d) (-6, -4) Given parabola is x2 + 12x – 9y = 0 ⇒ (x2 + 12x + 36) – 36 – 9y = 0 ⇒ (x + 6)2 = 9y + 36 ⇒ (x + 6)2 = 9(y + 4) ∴ Vertex = (-6, -4) |
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