What is the cross product of $(- 5 i + 4 j - 5 k)$ and $(- 4 i - 5 j + 2 k)$ ?

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Answer 1 · 2016-03-02T20:09:08

$vec a x vec b=-17i+30j+41k$

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$vec a x vec b=i(8-25)-j(-10-20)+k(25+16)$
$vec a x vec b=-17i+30j+41k$

What is the cross product of (- 5 i + 4 j - 5 k)(- 5 i + 4 j - 5 k) and (- 4 i - 5 j + 2 k)(- 4 i - 5 j + 2 k)?