Question

6. If f(x) = x + 3, then f(x) + f(-x) is equal to (a) 3 (b) 2x (c) 0 (d) 6​

Answer 1

Answer:

The correct answer is option (d).

Step-by-step explanation:

Given $f(x)=x+3$

So $f(-x)=-x+3$, replace x by -x in $f(x)$

Therefore $f(x)+f(-x)=(x+3)+(-x+3)$

                                      $=x+3-x+3\\=6$