Answer: Let point (−2,3,5),(1,2,3)and(7,0,−1) be denoted by P , Q , and R respectively. by using distance formula d= (x 2 −x 1 ) 2 +(y 2 −y 1 ) 2 +(z 1 −z 1 ) 2 Point P,Q and R are collinear if they lie on a line. PQ= (1+2) 2 +(2−3) 2 +(3−5) 2 = (3) 2 +(−1) 2 +(−2) 2 = 9+1+4 = 14 QR= (7−1) 2 +(0−2) 2 +(−1−3) 2 = (6) 2 0 Reply
Answer:
Let point (−2,3,5),(1,2,3)and(7,0,−1) be denoted by P , Q , and R respectively.
by using distance formula d=
(x
2
−x
1
)
2
+(y
2
−y
1
)
2
+(z
1
−z
1
)
2
Point P,Q and R are collinear if they lie on a line.
PQ=
(1+2)
2
+(2−3)
2
+(3−5)
2
=
(3)
2
+(−1)
2
+(−2)
2
=
9+1+4
=
14
QR=
(7−1)
2
+(0−2)
2
+(−1−3)
2
=
(6)
2
0
Answer:
do it by modulas formula it is easy