BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Please help function problem

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Junior | Next Rank: 30 Posts
Posts: 21
Joined: Thu Feb 14, 2008 9:06 am
Thanked: 1 times

by lagomez » Sat Apr 05, 2008 8:29 am
i used numbers

if i use x = 3 then

f(3) = f(1-x) or f(3) = (-2)

then i go through each question by doing:

a) f(x) = (1-x)
(1-3) = (1-(-2))
(-2) = (3) so this is wrong

i work may way down until d comes up
f(x) = x^2(1-x)^2

3^2(1-3)^2 = -2^2(1-(-2))^2
9(4) = 4(9)

this should work for any number you choose

so answer is D
Top
Newbie | Next Rank: 10 Posts
Posts: 7
Joined: Fri Apr 04, 2008 3:16 pm

by angela22 » Sat Apr 05, 2008 5:19 pm
thank you! functions has always been a weakness of mine! =) but just to make sure....this is what you did right??

set x=3 and plug it into the given function f(x)=f(1-x) which gives you:
f(3)=f(-2)

and then for all the answer choices you plugged in x=3 on one side and x=-2 for the other side and see which one is equal??
Top
Junior | Next Rank: 30 Posts
Posts: 21
Joined: Thu Feb 14, 2008 9:06 am
Thanked: 1 times

by lagomez » Sat Apr 05, 2008 8:20 pm
that is correct..try for any number x
Top
Post new topic Post Reply
• Page 1 of 1