For fx 6x 4 and gx x2 find the following functions and st
For f(x) = 6x + 4 and g(x) = x^2, find the following functions and state the domain of each. F o g g o f f o f g o g (fog)(x)=
Solution
f(x) = 6x+4 and g(x) =x^2
domain means the values of \'x\' that the function can have
f(x) domain: (-infinite, +infinite) [ there is no restrictions on \'x\' ]
g(x) domain also (-infinite, +infinite)
a).
(fog)(x) = f[g(x)]
= f[x^2]
= 6x^2 +4
domain: (-infinite, +infinite)
b). (gof)(x) = g[f(x)]
=g[6x+4]
= (6x+4)^2
domain: (-infinite, +infinite)
c).fof(x) =f[f(x)]
=f(6x+4)
= 6(6x+4) +4
=36x +28
domain: (-infinite, +infinite)
d).
gog(x) = g[g(x)]
=g(x^2)
= (x^2)^2
=x^4
domain: (-infinite, +infinite)
