Question

Match the expressions with the correct LCM
14x3, 15 y z3, & 12y3

Answer 1

here are the answer choices
420x3y3 z3
70x2 y2
12x2 y2
x2 + 6x + 8
x2 - 9
42xy3 z

Answer 2

ignoring the unknowns in your expression, do you know how to get the LCM of numbers

Answer 3

no

Answer 4

@arch1 @myko

Answer 5

420x3y3 z3

Answer 6

thank you :)

Answer 7

wat about 10x2 , 35x2 y2 ? @myko

Answer 8

ignoring the unknowns in your expression, do you know how to get the LCM of numbers?

Answer 9

no but that nots the right answer

Answer 10

hmm..... that's the right quaestion

Answer 11

yes and i gave you the answer choices ^^

Answer 12

is it 70x^2y^2

Answer 13

i mean that you should learn how to do it, so don't need somebody to just give you answers to same type of questions again and again

Answer 14

if you whant i explain you...

Answer 15

yes please

Answer 16

you got two numbers 10 and 35. Put them in prime factor form:
10 = 2*5
35= 7*5
so there are 2,5,7 prime factors involved. To find the LCD multiplie all commun factors. In this case there is just one lonly 5. So LCD =5. To find LCM multiplie all factors comun and not commun. So LCM=2*5*7 = 70
What for x^2y^2 just multiply all uknowns, becouse LCM have to have all of them. So the answer will be :
70x^2y^2

Answer 17

got it?

Answer 18

hmmm i actually understand that a lot!

Answer 19

ohk let me see if i can do this one alone and i will tell you my answer
x -3 , & x2 - 9

Answer 20

k

Answer 21

i got 27 but tht is not an answer choice

Answer 22

just one little addon on my explanation. Might happen that the prime factor form of a nummber is:
\[24=2^{3}*3\]
so where i said: "To find LCM multiplie all factors comun and not commun" should better say: multiply all factors commun and not commun taken with their highest exponents.

Answer 23

x -3 , & x2 - 9
is bit different.
x2 - 9=(x-3)(x+3)
think of (x-3), (x+3) like being prime factors of a simple nummber. The rest is same

Answer 24

x-3=x-3
x2 - 9=(x-3)(x+3)

so factors involved are (x-3) and (x+3)
LCM rule says, multiply them, so (x-3)(x+3)=x2 - 9 is LCM

Answer 25

so its the same thing? x^2-9?

Answer 26

yes

Answer 27

yay!!

Answer 28

i think you got it, :)

Answer 29

yes i do!