Given the points A(a, 3), B(-2, 1) and C(3, 2), find the possible value of a if the length of AB is twice the length of BC.
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using the distance formula to find the length of BC we have:
using some algebra and the fact that AB will be twice BC:
solve for a.
Thanks so much for all of your help.
I ended up getting a= -12 or 8, which is right. YAY!