SOLUTION: what is the value of r if the distance between the points(4,2)and (1,r)is 3 units

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Question 887637: what is the value of r if the distance between the points(4,2)and (1,r)is 3 units
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
sqrt%28%284-1%29%5E2%2B%282-r%29%5E2%29=3
sqrt%28%283%29%5E2%2B%282-r%29%5E2%29=3
9%2B%282-r%29%5E2=9
%282-r%29%5E2=0
The binomial multiplication was not necessary.
highlight%28r=2%29.