Question

if f (x)=2x+5, then find f (x)+f (-x)​

Answer 1

Explanation:

f(x) =2x+5 .......given

to find = f (-x)

now,

f(x) = 2×(-x) +5

= -2x +5

now,

equate them according to the question that is

f(x)+f(-x)

2x+5 + (-2x)+5

=2x +5-2x +5

=2x -2x+5+5

now,

2x and -2x will cut

=5+5

=10

this is your answer

hope its help you