Re: ISI-2009 MATH QUESTIONS

Posted by L14 on Apr 10, 2014; 5:19am
URL: http://discussion-forum.276.s1.nabble.com/ISI-2009-MATH-QUESTIONS-tp7586464p7586507.html

Hi jack
2f(x)+3f(-x)=55-7x
Put x=-x
2f(-x)+3f(x)=55+7x

4f(x)+6f(-x)=2(55-7x)-----a
6f(-x)+9f(x)=3(55+7x)-----b
b-a=> 5f(x)=55+35x
f(x)=11+7x
f(3)=32

Pls can someone explain 3. Ron, the image is too small to be read.