Question

2x1/-6x1/-5 please help!!

Answer 1

the / is a division sign

Answer 2

Can u pls type it using the equation tab below. It is difficult to understand it like this

Answer 3

well h/o.. write ur answer as a fraction in simplest form. does this help?


2 X 1 X 1
--- ---
-6 -5

Answer 4

The answer is 1/15

Answer 5

great! now how ab

Answer 6

When you have such multiplication of fractions, follow the rule :
(Here N means numerator and D means denomination)

N1 x N2 x N3 N1 x N2 x N3
-- -- -- = -------------
D1 D2 D3 D1 X D2 X D3

Answer 7

ohh ok

Answer 8

Now using this formula try to solve yourself and I'll check if it is correct

Answer 9

do u multiply the -7 with the N or D?

Answer 10

in the 2nd problem?

Answer 11

You can treat it as -7
--
1

So you multiply -7 with the numerator group

Answer 12

oh okay

Answer 13

soo

98
--
-54

Answer 14

Correct!!
But something more needs to be done

Answer 15

simplify? idk how to do that with this fraction

Answer 16

First, we hv to reduce it to lowest terms
Second, make the denominator positive

Answer 17

OK,
Both are even nos and hence divisible by 2
So go ahead and divide both by 2

Answer 18

Then multiply this by -1/-1 to make the denominator positive

Answer 19

Done????

Answer 20

49 -1
--- x ___
-27 -1

Answer 21

soo that means the answer is this?

-49
---
27

Answer 22

BINGO !!!!

You got the hang of it !!

Answer 23

yay! is that simplest form?

Answer 24

Now I'll teach you how to reduce it to lower terms easily

Answer 25

okay :)

Answer 26

Yes it is because 49 is 7 x 7
and 27 is 3 x 3 x 3
So both numbers do not hv any common factor left

Answer 27

okay thank u

Answer 28

your question was 2 x -7 x -7
--- ---
9 -6

Answer 29

We modify it to 2 x -7 x -7
--- --- ---
9 1 - 6

Answer 30

Now we can easily see that 2 in the numerator of first fraction and 6 in the denominator of third fraction are both divisible by 2 and so we divide them by 2 to get

1 x -7 x -7
--- --- ---
9 1 -3

Answer 31

Following me???

Answer 32

ok now i have another ?

is -3(3x-u)+(2u-4x) simplified to -9?

Answer 33

yes

Answer 34

Now you can clearly see that numerators on top and denominators at bottom cannot be cross -cut as they do not have common factors

so now multiply all numerators and all denominators and basically shift the - sign to the numerator

Answer 35

is that the simplified expression to that expression?

yes.thank u for explaining that to me.

Answer 36

Yes, when u hv many fractions, you can use cross-cutting to cancel out common factors
Now to yr second question.....

-3(3x-u)+(2u-4x) = -9x + 3u + 2u - 4x
= -9x - 4x + 3u + 2u
= - 13x + 5u

Answer 37

How did u arrive at -9 ??

Answer 38

-3(-3x-u)+(2u-4x)
-3(-3x)+1+(-4x)
-3+1+-7

Answer 39

i did it wrong

Answer 40

but i was supposed to distribute

Answer 41

Yes, when you have an expression like -3(3x-u), you have to first use the DISTRIBUTIVE LAW to open the bracket and then solve further

Answer 42

wait..it said that wasn't correct.

Answer 43

What's the ans u hv????

Answer 44

i got 5x-1u

Answer 45

1u ? :|

Answer 46

-3(-3x-u) + (2u-4x)
(9x-3u) + (2u-4x)
-1u + 5x
5x + -1u
5x-1u

Answer 47

Then u gave me the wrong question the first time around!!!! Go and check....

Answer 48

i did! i'm sorry!! ahaha i put 3 and it was supposed to be -3 i think

Answer 49

but am i correct (with the problem i just did)

Answer 50

Well, one can always make mistakes while typing......

No, your answer is not correct. See my working below...

-3(-3x-u) + (2u-4x) = 9x + 3u + 2u - 4x
= 9x - 4x + 3u + 2u
= 5x + 5u
= 5 (x + u)

Answer 51

"5x-1u " :\

why is there a 1 in front of the u ?

Answer 52

you write "5-u" , no need for the 1 , it just makes it look messy , whenever I mark maths if I see anyone write coeffiecent of 1 then they lose marks

Answer 53

But her answer is wrong anyway.....

Answer 54

yeh , doesnt mean you cant correct notation

Answer 55

agreed :)

Answer 56

But if you deduct marks for this, I feel u r too harsh on the students. Just putting a circle and remarking shud do th job

Answer 57

yeah but for my learning purposes i sometimes put the -1 so i don't lose track.

Answer 58

but anyway..i see what u did harkirat ... idk what the crap i did! haha

Answer 59

No sweat, we all learn by making mistakes and correcting them

Answer 60

yeh, probably for like year4 kids in primary you wouldnt mark down , but if they are in high school and writting coefficents of 1 then there is something wrong , it makes you looks stupid putting 1u , because that shows the marker that you dont know that 1 times u =u

Answer 61

@elecengineer
R u located in the US??

Answer 62

australia

Answer 63

R u an Indian by any chance??

Answer 64

no, not asian either

Answer 65

but alot of the electrical engineering lecturers at my uni are

Answer 66

im white lol

Answer 67

Just asking, hope u didn't mind

Answer 68

you shouldn't call students stupid...they mean the same thing. -1u and -u...just because it's marked differently doesnt mean you should mark down a grade..the answer is not wrong technically. its like your punishing your students because their teacher is a neat freak.

Answer 69

I'm an Indian and I know teachers here (in India) r very harsh with such things and penalise even small things

Answer 70

C'mon lauren, thats not nice

Answer 71

i dnt care what they say ^

Answer 72

but hey i'm just a first year college student. what do i know? but anywho the answer 5x+5u was correct!!! yayy!!

i'm sorry. i'm just the type of person who says what i feel. i'm sorry if i offended you. just different opinions that is all.

Answer 73

but seriously, if you are in high school you shouldnt need to write the 1s

Answer 74

you are first year of uni , 19yrs old and you still write the 1s , you should have dropped that a long time ago lol

Answer 75

C'mon friends, let us change the topic

Answer 76

Do u need to ask anything else lauren??

Answer 77

agreed. i don't like negativity. and yes...one sec please.

Answer 78

im not negative , just stating the facts, and I would be very surprised if a uni tutor doesnt mark down because of bad notation , its one thing to get the right answer, but you also need to express yourself confidently

Answer 79

if you click the link it makes it bigger.

Answer 80

^ thats first year uni math?

cant be

Answer 81

what do you mean by "college"

Answer 82

i'm in Math098...i'm not the best math student and have never really been good at math or liked it...but it is a lower level of math.

Answer 83

but i do go to a university.

Answer 84

k... thats like the stuff we do in year8 in high school in australia

Answer 85

lauren, u do it and tell me the ans
I'll confirm if it is ok
This is a simple one, just b careful while using the Dist. LAW

Answer 86

i got -11y+8

Answer 87

wow :p

Answer 88

Bingo !! Its correct , the working as follows

-4 (3y - 2) + y = -12y + 8 + y
= - 11y + 8

Answer 89

=)

Answer 90

I should go fetch a really hard version of these from one of my high maths text books , these are far too easy :p

Answer 91

something much more complex

Answer 92

k u go do that. lol

Answer 93

Ok lauren, give this a try

2(x+ 3y) -7(2y - 5z) + 3(2x - 3y +z)

Answer 94

Focus and you'll do it right

Answer 95

k h/o