Question

MEDAL AND FAN PLEASE
Find a(b) a= 4i + 3j, b= -4i + 4j

-4
28
< -16, 12>
< 0, 7>

Answer 1

(4i+3j)(-4i+4j)

Answer 2

??

Answer 3

do you mean ? dot product
or cross product

Answer 4

idk

Answer 5

\[(4i+3j).(-4i+4j)=4(-4) +3(4) =-16 +12=-4\] dot product is this . answer is a number

Answer 6

thanks!@amoodarya

Answer 7

but if you want cross product ...answer is a vector

Answer 8

\[\begin{vmatrix} i & j &k \\ 4 &3 &0 \\ -4 &4 &0 \end{vmatrix}=\\0 i -0j +(16-(3(-4))k=(0,0,28)\]this is cross product