First slide
Functions (XII)
Question

An even polynomial function f(x) satisfies a relation f2x1-f12x+f16x2y=f-2-f4xyx,yR-0andf4=-255,f0=1.   Then the value of f(2) is________

Difficult
Solution

Wehavef2x-f2xf12x+f16x2y=f-2-f4xyReplacingyby18x2,wegetf2x-f2x12x+f2=f-2-f12xf2x+f12x=f2xf12xAsfxisevenf2x=1±2xnorfx=1±xn

Now,f4=1±4n=-255Given

Taking negative sign, we get 256=4norn=4

Hence,  fx=1-x4,  which is an even function

Therefore, f2=-15.  

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