Question

f de x igual a x ao quadrado mais 2x mais 1 e g de x igual 2x menos 1 determine f g de x

Answer 1

f( x ) = x2 + 2x + 1
g( x ) = 2x - 1
f[g( x ) ] = ????

F( g(x) ) = F ( 2x - 1 )

F( 2x - 1 ) = ( 2x - 1 ) 2 + 2• ( 2x - 1 ) + 1
F( g(x) = 4x2 - 4x + 1 + 4x - 2 + 1
F(g( x ) ) 4x2 +0 + 0
F(g(x) ) = 4x2