Question

Determine vector A x C if A = 5i - 4j and B = 5i + 2j

Answer 1

Answer

Vectors

A = 5i - 4j

B = 5i + 2j

Then

$A\times B=\begin{vmatrix} i & j & k\\ 5 & -4 & 0\\5 &2&0 \end{vmatrix}$

=$i(0) -j(0) +k(10+20) \\=30k$