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Vectors Help !!!

Question: Point A has coordinates (2, 3, 6). Point B has coordinates (8, 6, 8). Find the point C so that AB and AC are in the same direction and |AC| = 77.

My working thus far: AB = (4 3 2) => AC = k(4 3 2) = 77

=> k * r29 = 77 => k = 77r29/29 => AC = 77r29/29 (4 3 2)

This looks too ugly to be right. Where have I gone wrong?
Reply 1
Avatar for mqb2766
mqb2766
21
Original post by sanctepiex
Question: Point A has coordinates (2, 3, 6). Point B has coordinates (8, 6, 8). Find the point C so that AB and AC are in the same direction and |AC| = 77.

My working thus far: AB = (4 3 2) => AC = k(4 3 2) = 77

=> k * r29 = 77 => k = 77r29/29 => AC = 77r29/29 (4 3 2)

This looks too ugly to be right. Where have I gone wrong?

AB isn't correct
Reply 2
Avatar for sanctepiex
sanctepiex
OP
4
Original post by mqb2766
AB isn't correct

Ah I got it now cheers

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