A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 5 years ago
what is the LCM of 15x,12x? I am tutoring a student who says that one simply drops the x? That can't be right
anonymous
 5 years ago
what is the LCM of 15x,12x? I am tutoring a student who says that one simply drops the x? That can't be right

This Question is Closed

apples
 5 years ago
Best ResponseYou've already chosen the best response.0You can't drop the x, since you don't know what its factors compose of. The lcm is instead \[\frac{12x \cdot 15x}{gcd(12x, 15x)}\] which should make enough sense; you need to multiply 12x and 15x together to find a common denominator, then divide by the greatest common denominator of that product.

radar
 5 years ago
Best ResponseYou've already chosen the best response.0the LCD is the smallest number that has the factors of 12x and 15x

radar
 5 years ago
Best ResponseYou've already chosen the best response.0the factors (prime) of 12 is 2*2*3 and 15 is 5*3 so the LCD must be 2*2*3*5 or 60

radar
 5 years ago
Best ResponseYou've already chosen the best response.0I forgot to include the x !! 60x

radar
 5 years ago
Best ResponseYou've already chosen the best response.0You can not simply drop the x!
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.