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  4. In three dimensional space, the equation x2 - x - 2 = 0 represents

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Q. In three dimensional space, the equation $x^2 - x - 2 = 0$ represents

Introduction to Three Dimensional Geometry

Solution:

$x^2 - x - 2 = 0 \, \Leftrightarrow (x - 2)(x + 1) = 0$
$\Leftrightarrow \, x = 2 , x = -1 $ which are the planes (both parallel to YOZ plane).