5) Dada as funções: f(x ) = 7x + 2 e g( x ) = 5x +1, calcule:
a) gof( x )
b) fog( x )
c ) gof(1 )
d) fog( -1 )
a) (g o f) (x) = 5 ( 7x + 2) + 1 = 35x + 10 + 1 = 35x + 11
b) (f o g) (x) = 7 ( 5x + 1) + 2 = 35x + 7 + 2 = 35x + 9
c) (g o f) (1) = 35 (1) + 11 = 46
d) (f o g) (-1) = 35(-1) + 9 = -26
