Let u = <-5, 1>, v = <7, -4>. Find 9u - 6v?
回答 (7)
2019-01-24 5:27 am
✔ 最佳答案
9<-5, 1> - 6<7, -4>= <-45, 9> - <42, -24>
= <-45, 9> + <-42, 24>
= <-87, 33>
2019-01-24 6:09 am
u = <-5, 1>. 9u = 9<-5,1> = <9*-5, 9*1> = <left for you>.
Now do the same for v & 6v
Then perform the subtraction of the two above; 9u-6v.
Show your steps & answers here if need be.
Hopefully no one will spoil you the answer thereby depriving you from your personal enhancement; that would be very inconsiderate of them
Now do the same for v & 6v
Then perform the subtraction of the two above; 9u-6v.
Show your steps & answers here if need be.
Hopefully no one will spoil you the answer thereby depriving you from your personal enhancement; that would be very inconsiderate of them
2019-01-24 5:52 am
rule:
If u=<a,b> , v = <c,d> , m , n ∈ R
then
mu+nv = <ma+nc , mb+nd>
If u=<a,b> , v = <c,d> , m , n ∈ R
then
mu+nv = <ma+nc , mb+nd>
2019-01-24 6:24 am
-5 ≤ u < 1
-4 < v ≤ 7
if i was right
9u
-45 ≤ 9u < 9
-6v
24 > -6v ≥ -42 ....... multiplying negative changes direction
now
-45 ≤ 9u < 9
42 ≤ -6v < 24
add together
-3 ≤ 9u - 6v < 33 ◄◄◄
-4 < v ≤ 7
if i was right
9u
-45 ≤ 9u < 9
-6v
24 > -6v ≥ -42 ....... multiplying negative changes direction
now
-45 ≤ 9u < 9
42 ≤ -6v < 24
add together
-3 ≤ 9u - 6v < 33 ◄◄◄
2019-01-24 5:59 am
u = - 5i + j
v = 7i - 4j
9u - 6v = - 45i + 9j - 42i + 24j
9u - 6v = - 87i + 33j
v = 7i - 4j
9u - 6v = - 45i + 9j - 42i + 24j
9u - 6v = - 87i + 33j
2019-01-24 5:14 am
9u - 6v
= <-45,9> - <42, -24>
= <-87, +15>
= <-45,9> - <42, -24>
= <-87, +15>
2019-01-24 5:11 am
<-51, 33>
收錄日期: 2021-05-01 22:18:15
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20190123210720AAvNYsO