Question

I need math help anyone!!

Answer 1

in which topic

Answer 2

I posted my quiz I need help:/ its inverse

Answer 3

sorry i dont know this yet

Answer 4

@Night-Watcher

Answer 5

@thomaster can you help me

Answer 6

on the second table, just divide the wins/losses, and the greatest number will be your team which scored the best.

Answer 7

and for the second one, since all numbers are being added to 0, the answer is kinda the same as the question

Answer 8

(the first matrix one in the question)

Answer 9

@kaylaelizabeth

Answer 10

okay thanks

Answer 11

ok, so matrix A={{-3,5,6},{9,-5,3}}, and B={{-2,6,7},{2,-1,-6}}
im not completely sure, but your doing -3A, if I am right, just multiply each number in the matrix A by -3. and same for B but with 6, because its 6*B, I'm not completely sure, so let me do the calculations just a sec

Answer 12

okay

Answer 13

yep, i did the calculations and how I explained it is 100% correct (and I'm just doing these questions for the first time, yet i still got it right) I LOVE MATH.

Answer 14

I forgot to say, after you did the multiplying by -3 and 6, you add the matrix's

Answer 15

okay so is it C?

Answer 16

nope, thats a close one, though, in matrix A on the second line, the second number is 9, not -27.

Answer 17

because (-5*-3)+(-1*6)=9, not -27

Answer 18

okay so it would be d?

Answer 19

Correct

Answer 20

@mathmale like how i did this one?

Answer 21

ok, for this one, you add the two given matrix's and thats your answer for x

Answer 22

I got -16 when I add them

Answer 23

not actually add all the number in the matrix's, but add their corresponding numbers for example (not actual answer to that specific question)

A={{04,02,08},{09,03,06}}
+B={{04,02,07},{08,03,06}}
=================
C={{08,04,15},{17,06,12}}
for adding them, you just add their corresponding numbers

Answer 24

okay so it would be c={4}

Answer 25

well, no because, you have to remember, in my example i wasn't adding negative numbers, in the question given, you are. know the rule for adding negative by a positive?

Answer 26

im not suree

Answer 27

doesn't the biggest number determine if its positive or negative

Answer 28

ok, so take, -4 and add 3 to it, a simple way i found to get this done is to just instead of,
-4+3=?
i would do,
3-4=?
which would result in the same thing

Answer 29

understand?

Answer 30

ohh okay so c= 2-8 and 2-4?

Answer 31

remember, that your adding by the corresponding place in the second matrix, so actually for the first number in the matrix's, 2+4=?, the second number, (-8)+(-6)=? and so on for the rest of the matrix

Answer 32

okay so 2+4 ,-8+-6, -4+2, 2+-8

Answer 33

correct

Answer 34

want a trick for adding both negatives?

Answer 35

yeah sure

Answer 36

ok so the second numbers in the matrix are -8 and -6,
just turn,
(-8)+(-6)=?
into,
8+6=? and just stick a negative sign on the answer

-8 + -6 = ?
8 + 6 = 14, now just stick a negative sign to it, into -14, and theres your answer for adding those negative numbers

Answer 37

its a lot faster, since most brains can mainly handle adding positives a bunch times faster

Answer 38

btw, what grade are you in? (if you don't mind me asking)

Answer 39

okay so would my answer be A? and 11th

Answer 40

correct, and holy smokes, I'm in 10th grade doing 11th grade work SWEET, what specific math class is this for?

Answer 41

it is algebra 2b its hard I don't understand most of it

Answer 42

sweet, XD i know this stuff really good, because in a way you could see it as adding in computer language.

Answer 43

for this, you do the same, but instead of adding , you multiply

Answer 44

okay so it would be c= 5*-4,5*9,-2*8,3*7

Answer 45

correct

Answer 46

so it would be -20
45
-16
21

Answer 47

again correct :) nice, your getting the hang of this pretty good

Answer 48

thanks but none of those are an option :/

Answer 49

0.0 its the correct way, well, this is awkward, just a sec

Answer 50

okay

Answer 51

XD ok for some freaky reason, multiplying matrix's is different than actual multiplication

Answer 52

wow, this is gunna be weird to explain lol

Answer 53

ok here it goes:
.....A..........B
{05|05} {-4|09}
{-2|03} {08|07}

XD, ok so for multiplying matrix's you take the 1st row of the first matrix, and you multiply by the first COLUMN in the second matrix to get the 1st number, then the first row in matrix again, and multiply by the second COLUMN in the second matrix., and same thing for the second row in the first matrix

Answer 54

i guess its done like that, because some matrix's can have different dimensions like, matrix A is, 3x2 and the second is 2x3, and so it will leave no un-multiplied numbers

Answer 55

so what does this mean

Answer 56

{05|05} {-4|09}
{-2|03} {08|07}

{a|a} {A|B}
{b|b} {A|B}

taking this into consideration
{(a*A),(a*B)}
{(b*A),(b*B)}

you might have to take a good look at it, but i promise you'll understand if you look back and forth between them.

Answer 57

okay im getting D

Answer 58

XD ok wait let me explain it better

{aa|ab} {AA|BA}
{ba|bb} {AB|BB}

taking this into consideration
{(aa*AA+aa*AB),(ab*AA+ab*AB)}
{(ba*BA+ba*BB),(bb*BA+bb*BB)}

Answer 59

okay now I got b

Answer 60

{(aa*AA+aa*AB),(ab*BA+ab*BB)}
{(ba*AA+ba*AB),(bb*BA+bb*BB)}

oops sorry for that, the table above is now 100% correct

Answer 61

okay now I got D

Answer 62

? can you type your steps

Answer 63

the answer, is A, you could compare the results you calculated from that.

Answer 64

still there?

Answer 65

yeah I got 20 80 -8 and 48

Answer 66

I got it now I got the right numbers

Answer 67

undefined because there are not the same amount of dimensions in the second as there is in the first

Answer 68

thanks

Answer 69

im not sure, though I would go with yes, because the numbers in matrix A match the numbers in matrix B but inverse

Answer 70

though i could be wrong, let me confirm

Answer 71

yep i was right

Answer 72

invert all the numbers and switch the first number in the matrix and the very last number, and theres your inverted matrix (invert means to turn -1 into 1, and 1 into -1, but with any number)

Answer 73

okay one sec

Answer 74

wait, don't switch the last and first, not for this problem

Answer 75

I got D

Answer 76

remember, you take a positive and make it a negative, and take a negative and make it a positive, and do not switch any numbers around

Answer 77

I got c now

Answer 78

the picture shows only 3 given answers... what is D?

Answer 79

type in what you got?

Answer 80

oh it got cut off d is no exist

Answer 81

so, if by C u mean B?

Answer 82

7 25
-2 -7

Answer 83

ok, lol i got a little confused on what you got there for a sec, and yes that is correct

Answer 84

brb 10 minutes i have to do a chore

Answer 85

okay thanks the next one looks hard

Answer 86

is that an equal sign between the matrix's?

Answer 87

a minus sign