Question

helpppppppppppp !! :(

what is the LCD of 3x/x+1 plus x+1/2x plus 5/x ??

Answer 1

The least common denominator of two or more non-zero denominators is actually the smallest whole number that is divisible by each of the denominators.
Do you know what that means?

Answer 2

perhaps a demo @Ledah ?

Answer 3

would it be x then ? since thats the only one that goes into all of the denominators ?

Answer 4

Look again. Looking for the smallest whole number.

Answer 5

soo then it would be .... 1 ... ?

Answer 6

First we list the multiples of each denominator.
Multiples of 5 are 10, 15, 20, 25, 30, 35, 40,…
Multiples of 6 are 12, 18, 24, 30, 36, 42, 48,…
Multiples of 15 are 30, 45, 60, 75, 90,….

Answer 7

take a look at the example

Answer 8

Now, when you look at the list of multiples, you can see that 30 is the smallest number that appears in each list.
Therefore, the least common denominator of 1/5, 1/6 and 1/15 is 30

Answer 9

ohhhh i was thinking it would be like a really small number ..

Answer 10

30 isnt one of my choices though :/ i have

A) 2(x2 + 1)
B) 2x + 1
C) 2x(x + 1)
D) 2(x + 1)

Answer 11

Nah. Lol I could've explained better :O sorry lol

Answer 12

oh haha you're fine !

Answer 13

Okay so in this case.
Might be a bit tougher..

Answer 14

thats what i was thinking :P

Answer 15

this is why I hated Algebra 2 -_-

Answer 16

same :/ i might just guess . it wont kill me to get one problem wrong :)

Answer 17

make the best guess you can then :D