Question

Let u = <-5, 1>, v = <7, -4>. Find 9u - 6v

Answer 1

\(\bf u=<a,b>\qquad v=<c,d>\quad
\begin{cases}
9u\to 9<a,b>\to <9\cdot a,9\cdot b>\\
\bf 6v\to 6<c,d>\to <6\cdot c,6\cdot d>
\end{cases}
\\ \quad \\
u-v\implies <a,b>-<c,d>\implies <a-c,b-d>\)

Answer 2

so you'd do the "scalar multiplication" first, and whatever vectors you get, SUM them up, or SUBTRACT them in this case

Answer 3

now replace a and b, c and d, with the number they gave you, and follow what john doe told you...

Answer 4

is it <-87, 33>
?

Answer 5

i only checked your x part of the vector it is right..

Answer 6

ok yes it is right

Answer 7

Thanks!