Question

Find f(a+3) when f(x)=x^2+1

Answer 1

f(x)=x^2+1

when x is replace by a

f(a)=a^2+1

when a is replace by a+3

f(a+3)=(a+3)^2+1

=a^2+6a+9+1

=a^2+6a+10

Explanation: