Question

1.) Find a ⋅ b.

a = 7i - 4j, b = 4i + 3j
<28, -12>
16
-40
<11, -1>

2.)Let u = <-4, 1>, v = <-1, 6>. Find -2u + 4v.
<4, 22>
<4, 7>
<12, -26>
<10, -14>

Answer 1

is that a-b

Answer 2

@princeharryyy a times b

Answer 3

the product @em2000

Answer 4

yes

Answer 5

multiply i by i and j by j

Answer 6

i got <11, -1> for the final answer, is that what you got? @princeharryyy

Answer 7

u added but we need to multiply

Answer 8

try A

Answer 9

what happened @em2000

Answer 10

7*4 is 28 and -4*3 is -12

Answer 11

@princeharryyy gotcha that makes sense. i got <12, -26> for #2 is that wrong?

Answer 12

but before i tell you about the first and second answer, are you doing scalar vectors.

Answer 13

@em2000

Answer 14

@princeharryyy yes

Answer 15

then it's my bad. the first ones answer won't be A part

Answer 16

@princeharryyy actually im not sure, the instructions dont specify

Answer 17

< and > means vectors that's why i asked

Answer 18

let me tell how they work

Answer 19

i.i =1,
j.j =1
i.j =0 (iand j are at 90 degrees)