Login

Welcome, Guest. Please login or register.

October 17, 2025, 06:16:56 am

Author Topic: Just a few qsts.  (Read 829 times)  Share 

0 Members and 1 Guest are viewing this topic.

lacoste

  • Victorian
  • Forum Leader
  • ****
  • Posts: 973
  • Respect: +2
Just a few qsts.
« on: November 06, 2008, 05:53:23 pm »
0
I'm stuck on these questions ... any help would be appreciated

1). 8^(x+1) =   4^(3x-1)/2^(2x)

2). 5^(2x)-4(5^x)-5=0

3). Find the set of values of q for which 4* 2^(0.2q)  >2 ? 




Cheers!!

Mao

  • CH41RMN
  • Honorary Moderator
  • Great Wonder of ATAR Notes
  • *******
  • Posts: 9181
  • Respect: +390
  • School: Kambrya College
  • School Grad Year: 2008
Re: Just a few qsts.
« Reply #1 on: November 06, 2008, 05:56:32 pm »
0
1.





2. let



3.





EDIT: phail typo is phail :(
« Last Edit: November 06, 2008, 07:02:01 pm by Mao »
Editor for ATARNotes Chemistry study guides.

VCE 2008 | Monash BSc (Chem., Appl. Math.) 2009-2011 | UoM BScHon (Chem.) 2012 | UoM PhD (Chem.) 2013-2015

nerd

  • Victorian
  • Forum Obsessive
  • ***
  • Posts: 327
  • Respect: +51
Re: Just a few qsts.
« Reply #2 on: November 06, 2008, 06:50:00 pm »
0
1.





2. let



3.





Umm...for question 1, I think it would be

2008
Hebrew - 33 (scaled 44)   |   Maths Methods - 45 (scaled 48)

2009
Specialist Maths   |   Chemistry   |   English   |   Biology   |   Further Maths

lacoste

  • Victorian
  • Forum Leader
  • ****
  • Posts: 973
  • Respect: +2
Re: Just a few qsts.
« Reply #3 on: November 06, 2008, 07:45:46 pm »
0
3.






do i solve for q? and if so, is that the only set of values (Q was "
3). Find the set of values of q for which 4* 2^(0.2q)  >2 ?  ")


does q=-5?

Lulu

  • Victorian
  • Trendsetter
  • **
  • Posts: 145
  • Respect: +1
Re: Just a few qsts.
« Reply #4 on: November 06, 2008, 07:50:49 pm »
0
0.2q + 2 >1

0.2q > -1

q > -5


that is your set of values

you can test it by putting -5 back into your equation, you'll find that it equals exactly 2, therefore any x-value above -5 will satisfy the condition
[english][methods][spesh][psych][chinese][BM]
Aiming for an ENTER of 95+