Question

1. Find –5A + 4B

Answer 1

sorry hun i have not done this in a long time go to wolfram.com that might help

Answer 2

I can help.

Answer 3

thanks please help

Answer 4

Multiply -5 to the matric A,same goes to 4 multiply to the matric B.

Answer 5

Okay so first multiply A by -5
So we get
[-30 -5]
[20 30]=A
[-35 35]

Answer 6

ok

Answer 7

Then multiply 4 by B
And get
[-20 -4]
[-12 -32]
[24 32]

Answer 8

[-30 -5] [-20 -4]
[20 30]- [-12 -32]
[-35 35] [24 32]

Answer 9

Then after you finish multiply them,you need to add acording to the ques. -5A+4B.So for example:A=(-30 -5)+B=(-20 -4)
you will get -30-20=-50, -5-4=-9

Answer 10

-30-(-20)=-10
-5-(-4)=-1
20-(-12)=32
30-(-32)=62
-35-24=-59
35-32=3
So final is
[-10 -1]
[32 62]
[-59 3]

Answer 11

ok thank you

Answer 12

Does that look right to you?

Answer 13

Oh wait its wrong :/

Answer 14

Ope. And I see why. I subtracted instead added. I am greatly sorry.

Answer 15

its fine

Answer 16

So it should be like this,
-30+(-20)=-50
-5+(-4)=-9
20+(-12)=8
30+(-32)=-2
-35+24=-11
35+32=67

(-50 -9)
( 8 -2)
(-11 67)