Question

find the value |i-j|^2​

Answer 1

SOLUTION

TO DETERMINE

The value of

${ | \vec{i} - \vec{j}| }^{2}$

EVALUATION

$= ( \vec{i} - \vec{j}) .( \vec{i} - \vec{j})$

$= \vec{i} . \vec{i} - \vec{i} . \vec{j} - \vec{j} . \vec{i} + \vec{j} . \vec{j}$

$= 1 - 0 - 0 + 1$

$= 2$

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