Question

Dado f(x) = x^2+3x+1 y g(x)=2x-3
Calcular:
A) (fog) (4)
B) (fof) (0)

Answer 1

[f(x)=x^2+2x-3] / [g(x)=x^2+3x-4] = 
= (x-1)*(x+3) / [(x+4)*(x-1)] = 
= (x+3) / [(x+4) 

b) f o g(x) = 
f(g(x))=(x^2+3x-4)^2+2(x^2+3x-4)-3 

c) g 0 f(x) 
g(f(x)= (x^2+2x-3)^2+3(x^2+2x-3)-4 
 salu2