Question

Question #b434a

Answer 1

`f(9)=-15`

Explanation:

`f(x)=ax^7+bx^5+cx^3-6`

`f(x)=g(x)-6`

where

`g(x)=ax^7+bx^5+cx^3`

is an odd function such that `g(x)=-g(-x)`

Now if `f(-9)=g(-9)-6=3` then

`f(9)=g(9)-6 = -g(-9)-6` but

`g(-9)=9` then

`f(9) = -9-6=-15`