Question

Given u = 3i − 8j and v = −4i + 8j, what is u • v?

73
8
−76
−56

Answer 1

\((3i-8j)(-4i+8j)\)

That’s what “\(u \times v\) is, just solve it now

Answer 2

@extrinix Could you help solve it

Answer 3

ik how to get the equation thats the easy part haha

Answer 4

Okay well, the easiest way is to stack them on top of each other, like so

\(~~3i-8j \\
\times -4i+8j\)

Answer 5

And in doing this, you’ll see that it will be close to this:

\(Xi^2 \underline{+} Xj^2\)
(\(X\) is a number; when solved, just replace it with the number)

I’ll let you do the math

Answer 6

lmao thanks bro

Answer 7

@extrinix Ngl man i completely forgot ALL of this can you finish da problem for me sorry