Question

How do I simplify 2m/m-9 + 18/9-m?

Answer 1

2m 18
----- + ------
m - 9 -(m-9)

Answer 2

first muliply the right side by -1/-1

Answer 3

then add

Answer 4

really?

Answer 5

factor out a 2

Answer 6

'cause my teacher said:

9-m = --9 +- m
= - (-9 + m)
= - (m-9)

Answer 7

yeah cause we want a common denominator

Answer 8

ohh i see

Answer 9

the second post was your attempt?

Answer 10

yea so you got it

Answer 11

no I don't// cos I don't know what to do after..

Answer 12

2m 18 (-1)
----- + ------ * ----
m - 9 -(m-9) (-1)

Answer 13

that bring the negitive up top

Answer 14

I only got to

2m 18
---- + ----
m-9 -(m-9)

Answer 15

OHHH.

Answer 16

why did you multiply by -1?

Answer 17

which is also the same as
2m 18
----- - ------
m - 9 (m-9)

Answer 18

cause you can mupliply any thing by -1/-1

Answer 19

without changing it

Answer 20

a/a = 1

Answer 21

i basically just muplitplied it by -1/-1 = 1

Answer 22

from there you have a common denominator

Answer 23

and can simplify

Answer 24

ohhhh, i see. Thank you!

Answer 25

no problem =P

Answer 26

the final answer is 2

Answer 27

^ why is it 2?

Answer 28

how far did you get?

Answer 29

because I have

2m-18
------
m-9

Answer 30

you can factor 2 out of each term in the numerator to get 2(m-9)

Answer 31

and (m-9)/(m-9) =1

Answer 32

what do you mean factor 2 out of each term?

Answer 33

you know 2x+2y= 2(x+y), for example?

Answer 34

or 2m-18= 2*m- 2*9 = 2(m-9)

Answer 35

ohhh, yup.

Answer 36

and what do you mean by (m-9)/(m-9)? Is it possible for you to draw how you did it?

Answer 37

you know a number divided by itself is 1
(m-9) is a number (you just don't know exactly what number)

Answer 38

ohh, yup.