Question

if f:R-R and g:R-R be defined by f(x)=x+1 and g(x)=x+2 find gof and fog​

Answer 1

f(x)= x +1

f(1) = 1+1=2

f(2)=2+1=3

f(3)=3+1=4

g(x) = x+2

g(1)=1+2=3

g(2)=2+2=4

f(g(x))= ?

f(g(1))=f(3)

=4

Hence, f(g(x))=4

g(f(x))=?

g(f(2))=2+2

=4

Hence, g(f(x))=4

Thank you.