Question

if f(x)=x^4-3x+1 then f(1)+f(2)=....​

Answer 1

$f (x) = (x + 2) / (3x – 1)f {f (x)} = f ((x + 2) / (3x – 1))= {[x + 2] / [3x – 1]} + 2 / 3 {[x + 2] / [3x – 1]} -1= 7x / 7= x$

In written formula

f (x) = (x + 2) / (3x – 1)

f {f (x)} = f ((x + 2) / (3x – 1))

= {[x + 2] / [3x – 1]} + 2 / 3 {[x + 2] / [3x – 1]} -1

= 7x / 7

= x