x Turn on thread page Beta
 You are Here: Home >< Maths

# Factorials watch

1. (7!+8!+9!)^2
-----------------
(4!+5!+6!)^2

can you help me with this? the answers suppose be in the format of 2^a * 3^b * 5^c * 7^d.
2. (Original post by DusanZiga)
(7!+8!+9!)^2
-----------------
(4!+5!+6!)^2

can you help me with this? the answers suppose be in the format of 2^a * 3^b * 5^c * 7^d.
Take a factor out of 7! on the top, and 4! on the bottom, then split into prime factors, and collect like terms
3. (Original post by tas1998)
Take a factor out of 7! on the top, and 4! on the bottom, then split into prime factors, and collect like terms
can you explain it little be further I still can't get the right answer.
4. Onxe you have it in terms of the prime factors, and square it out, the answer becomes clear. The factorization step is just a time saver. Youll notice that the answer is in terms of powers of 2 3 5 and 7, this is a clue.
You also need to know power rules
5. (Original post by tas1998)
Onxe you have it in terms of the prime factors, and square it out, the answer becomes clear. The factorization step is just a time saver. Youll notice that the answer is in terms of powers of 2 3 5 and 7, this is a clue.
You also need to know power rules
When I added the powers up I got 8 as an answer.
6. (Original post by DusanZiga)
When I added the powers up I got 8 as an answer.
Yes, I did too. 7²x5²x3^6x2^-2 is the correct answer, with questions like these you can check on a calculator.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 27, 2015
Today on TSR

### Ask the House of Commons anything

The digital outreach team is online until 4pm!

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams