Question

Dadas as funções f(x)= 4x-9 e g(x)= x²+5x, determine as funções compostas:
a)f(g(x))
b)g(f(x))

Answer 1

a)f(x²+5x)=4.(x²+5x)-9= 4x²+20x-9
b)g(4x-9)=(4x-9)²+5.(4x-9)=
16x²-72x+81+20x-45= 16x²-52x+36