FIND x if the distance between (5,-1,7) and (x,5,1) is 9units
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using distance formula root[ (x-5)^2+(5+1)^2+(1-7)^2]=9
orr squaring both sides
(x-5)^2+36+36=81
orr (x-5)^2= 81-72=9
or x-5=+_3
hence x= 3+5=8
and -3+ 5=2
orr squaring both sides
(x-5)^2+36+36=81
orr (x-5)^2= 81-72=9
or x-5=+_3
hence x= 3+5=8
and -3+ 5=2
seemavathi:
thanks brother
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