document.write( "Question 64799: please find the distance between (-2,3,1) and (4,5,-1)\r
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\n" ); document.write( "\n" ); document.write( "the midpoint of the points (-2,3,1) and (4,5,-1)\r
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Algebra.Com's Answer #46075 by venugopalramana(3286)\"\" \"About 
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please find the distance between P(X1,Y1,Z1)=(-2,3,1) and Q(X2,Y2,Z2)=(4,5,-1)
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\n" ); document.write( "the midpoint of the points P(-2,3,1) and Q(4,5,-1)
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\n" ); document.write( "PQ=SQRT[(X2-X1)^2+(Y2-Y1)^2+(Z2-Z1)^2]=SQRT[(4+2)^2+(5-3)^2+(-1-1)^2]
\n" ); document.write( "=SQRT[36+4+4]=SQRT(44)=2SQRT(11)
\n" ); document.write( "LET R(X,Y,Z) BE THE MID POINT
\n" ); document.write( "X=(X1+X2)/2....ETC.
\n" ); document.write( "HENCE R IS
\n" ); document.write( "=[(-2+4)/2,(3+5)/2,(1-1)/2]
\n" ); document.write( "=(1,4,0)
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