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#### karush

##### Well-known member

- Jan 31, 2012

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View attachment 1034

The coordinates of $A$ and $B$ are $A(7, -3, -5), B(17, 2, 5)$

a) Find (i) $\vec{AB}$ and (ii) $|AB|$

$\vec{AB}=A+B=(24, -1, 0)$

$|AB|=\sqrt{(17-7)^2+(-3-2)^2+(-5-5)^2}=15$

was assuming that $A$ and $B$ have origin of zero.

there are $7$ more question to this problem but thot I would see if this starting out right since the rest of it is built on this.