Find the value of for which the distance between the points and is units.

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

Problem

Find the value of

a>7

for which the distance between the points

P(a,3,5)

and

Q(7,1,-2)

9

units. (a)

7+2\sqrt{17}

(b)

7+4\sqrt{7}

(c)

7+2\sqrt{7}

(d)

7+\sqrt{77}