Question

If f(x)=x^2 + 1 and g(x)=2x, find [f o g](x).

Answer 1

just substitute the x on f(x) for (2x)

Answer 2

wait

Answer 3

so 2x^2 + 2?

Answer 4

\[[f\circ g](x)=f(g(x))=f(2x)=(2x)^2+1\]

Answer 5

thank you!