Question 606297
d = {{{sqrt((x[2]-x[1])^2+(y[2]-y[1])^2+(z[2]-z[1])^2)}}}

A(-1, 2, 3) and B(4, -5, 6)

{{{x[1]=-1}}}, {{{y[1]=2}}}, {{{z[1]=3}}}, 

{{{x[2]=4}}}, {{{y[2]=-5}}}, {{{z[2]=6}}}

d = {{{sqrt((  (4) - (-1) )^2+( (-5) - (2) )^2+( (6) - (3) )^2 )}}}

d = {{{sqrt((  4 +1 )^2+( -5 - 2 )^2+( 6 - 3 )^2 )}}}

d = {{{sqrt((  5 )^2+( -7 )^2+( 3 )^2 )}}}

d = {{{sqrt(25+49+9)}}}

d = {{{sqrt(83)}}}, to nearest tenth 9.1

Edwin</pre>