The point is units away from the origin

MATHEMATICS · Single correct · CBSE · Mathematics · Introduction to Three-Dimensional Geometry · Introduction to Three-Dimensional Geometry

Problem

The point

P(4,y,-1)

is

6

units away from the origin. If

y<0

, determine the value of

y

. (a)

-\sqrt{21}

(b)

-\sqrt{19}

(c)

\sqrt{19}

(d)

-2\sqrt{5}

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