Question

Factorise
b) 2(8 factorial)-7 factorial
@mathmale

Answer 1

Is that equivalent to 2*8!-7! ?

Answer 2

yes

Answer 3

Please factor 8! by factoring out the 8. What's left?

Answer 4

1

Answer 5

Hint:

8! = 8*7*6*5*4*3*2*1

What would happen if you were to divide both sides by 8?

Answer 6

The whole equation

Answer 7

@mathmale

Answer 8

(n+1)! = (n+1) n!

Answer 9

Eric, I'm sorry, but OpenStudy was not responding for a while.

Your job here is to find the factors of 2*8! - 7!

I've been asking you to focus on that 8! alone. 8! = 8*7!, so

2*8! - 7! = 2*8*7! - 7!

Can you factor that?

Answer 10

I got it... It's 15(7!)

Answer 11

Thanks @mathmale

Answer 12

My great pleasure. Always happy to be in touch with you.