Question
परवलय ${x^2} = 2x + 2y$ की नाभि है
या ${x^2} - 2x + 1 = 2y + 1$
${(x - 1)^2} = 2\left( {y + \frac{1}{2}} \right)$
यहाँ $4a = 2$
$\Rightarrow a = \frac{1}{2}$
अब नाभि $\left( {x - 1 = 0,\,y + \frac{1}{2} = \frac{1}{2}} \right)$ अर्थात् $(1, 0)$ है।
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